How to measure low frequency radiation + Gauss meters comparison guide

How to easily measure radiation from high-voltage power lines, cables, transformers, electric devices laptops etc. How to choose an economical, reliable and easy to use low frequency radiation meter. Which are the necessary features. How to use the meter to spot radiation sources and reduce your radiation exposure.

various low frequency radiation sources

Not the type of meter you are looking for? Please check our guides on high frequency meters (measure radiation from from cordless phones, wireless modems (Wi-Fi), cell phone masts etc), radioactivity meters (measure radiation from radon gas, granite counters, nuclear accidents etc) or check the frequently asked questions about electromagnetic field meters!

We advise you to read all the following information about how to use a low frequency meter and which are the important features to look for, but if you are in a hurry to see the recommended meters go straight to the low frequency meters comparison tables at the end of the article.

What do low frequency meters measure?

Low frequency radiation meters measure magnetic and / or electric fields from all wired radiation sources (power lines, cables, electrical appliances etc).

All cables, devices and other conductors that are connected to the power network generate electrical alternative current (AC) fields due to electrical voltage. When electrical current flows through the conductors (when there is electricity consumption) AC magnetic fields are also produced.

So, when an electric appliance is plugged in the electrical socket, an electric field is created due to voltage. When the device in turned on a magnetic field is produced due to electrical current flow.

Electric fields from power lines, transformers etc do not penetrate interior areas because they are grounded by most building materials (except near glass or in wooden houses).

Magnetic fields on the other hand penetrate all areas since they are unaffected by most building materials.

Which are the main sources of magnetic fields?

  • high voltage power transmission cables (the cables are the source - not the pillars)
  • low and medium voltage power distribution cables (low voltage wires are the main cause of high magnetic fields)
  • power transformers
  • electrical meter and electrical panels
  • large consumer appliances such as kitchen, electric heaters, floor heating, boilers, etc.
  • low voltage devices operating with a power transformer such as low voltage lighting and lamps, phone chargers, electric clocks, laptops etc.
  • appliances with electric motors such as the refrigerator, blender, vacuum cleaner, air fans, hair dryers, etc.
  • televisions and computer screens (the older type CRT)
  • wiring errors (such as neutral conductor connections from different circuits)
  • leakage currents on the electrical ground and earthed metallic parts (e.g. water pipes, heating pipes)
  • asymmetric charge distribution in a three phase power system
  • underfloor heating (with electrical resistance wires instead of plastic water tubing).
  • alternators for photovoltaic systems

Measuring magnetic fields is, in our opinion, the most important radiation measurement in order to assess the electromagnetic burden of a building, especially before buying a property, since high values of magnetic fields are usually difficult and expensive to reduce.

Which are the main sources of electric fields?

  • all electrical appliances when they are not connected to the electrical ground (depends on the plug – bipolar ones do not ground the appliance as opposed to schuko plugs)
  • the cables are in the walls that power electrical outlets, sockets and lights (especially when there are not grounded or the grounding is not functional, or the electrical connections are faulty or the cables insulation is damaged).
  • high voltage power lines cables (usually only outdoors - except near glass or in wooden houses)

Low frequency electric field measurements in our opinion are most relevant in areas such as bedrooms, where the continuous power supply of devices and circuits is not necessary and there are many simple ways to reduce it. Additionally, many scientists believe the presence of high electric fields considered more burdensome during night sleep.

How to measure low frequency fields + Solutions

If you are using a triple axis meter (recommended) just turn it on and measure.

If you are using a single axis meter rotate it to all directions and see the highest reading (rough estimate of the total radiation).

By measuring you can detect the radiation sources and remove them or replace them or increase your distance from them.

Magnetic fields can be shielded but magnetic shielding materials are very expensive and not always helpful.

Electric fields can be shielded more easy by using conductive materials that are grounded: from trees to conductive paints and meshes.

See more ways to reduce your radiation exposure…

What features to look for in a low frequeny magnetic and/or electric field meter

Manufacturer

A reputable company or country of manufacture could mean better quality and extended operating life. Being more geographically close might be helpful if there is a malfunction of the meter or you need to send it back for recalibration.

Average price

This is the average price of the meter sold by the various online sellers shown on the bottom of each table.

Antenna/Sensor

Meters with a single axis or 1D sensor can measure only in one direction at a time, so in order to measure the total radiation you will need to measure separately in each of the three axes by rotating the meter accordingly and then calculate the vector sum or find the axis with the maximum value to roughly find the total value.

3-axis meters on the other hand calculate directly the total three-dimensional value. A 3-axis meter is much easier to use and helps you perform quicker and more accurate measurements.

Frequency range (MHz)

The main frequency range that interests us is the 50-60Hz (frequency of the power grid) and covering this frequency range should be enough for most users.

Electronic devices with non linear loads (inverter AC, fluorescent lights etc) may emit in frequencies in the 20000-40000Hz range. Measuring up to this range might elevate the measured values a bit, but will also take into account the dirty electricity phenomenon, caused by harmonics.

Being able to distinguish between measurements in the 50-60Hz range and in higher frequencies is an additional feature some meters offer.

Units of measurement

Magnetic field meters measure magnetic flux density (B) in nT (= nano Tesla = 0,000000001 Tesla) or μΤ = uT (= micro Tesla = 0,000001 Tesla) or mG (= milli Gauss = 0,001Gauss). So 100nT=1mG

Electric field meters measure electric field intensity (E) in V / m (= volts per meter).

An alternative and interesting way of measuring the electric field is by measuring Body Voltage in milliVolts (= mV = 0,001 Volt). We connect a multimeter with the electrical ground and our body and record the alternating voltage developed through capacitive coupling of the human body with the surrounding electric fields.

Measurement range

We should take into account the lowest recommend safety limits and also the electromagnetic fields emitted by the most common radiation sources:

Magnetic field meters should be able to record in the 50-2000nT (0,5-20mG) range. Higher levels might be recorded in the very close vicinity (<0,5 m) to certain transformers, motors etc.

Electric field meters should be able to record in the 1-200V/m range.

What are the safe levels of low frequency radiation?

The legal exposure limits to non-ionizing electromagnetic radiation today are in most countries aligned with the limits set by the International Commission for the Protection against Non-Ionizing Radiation Protection (ICNIRP), which recognize only the thermal effect of radiation and do not take into consideration other non thermal, effects such as the production of stress proteins, increased activity of free radicals, calcium outflow, increased permeability of blood-brain barrier, platelet aggregation, increased production of histamine etc.

The past few years many scientific bodies have proposed new exposure limits to protect the public from artificial electromagnetic fields, based on recent research showing that non-thermal radiation levels can lead to serious long-term health effects.

The differences in the proposed safe limits are quite remarkable as you can see on the table below:

MAGNETIC FIELDS
SCIENTIFIC BODY Proposed safety limit
in nT in mG 
ICNIRP (International Commission for the Protection against Non-Ionizing Radiation Protection) 100000 1000
WHO = World Health Organization = World Health Organization (International Agency for Research on Cancer, a branch of the WHO has classified magnetic fields in the "possibly carcinogenic" based on studies that have linked 300-400nT with doubling the chance of childhood leukemia) 300-400 3-4
NCRP = National Council Of Radiation Protection and Measurement = National Council on Radiation Protection US (Non-validated scientific panel's recommendations NCRP - Scientific Committee 89-3 Report on Extremely Low Frequency Electric and Magnetic Fields) 200 2
TCO = Ecological Model for electronic devices (distance 30 cm) 200 2
argeTQ = green Austrian residential certificate 200 2
ÖKOPASS = residential certification, Austrian Institute of Biology Building (IBO) 100 1
Austrian Medical Association 100 1
German Building Biology Institue IBN (Institut für Baubiologie + Ökologie Neubeuern - Recommendations for the bedrooms) 100 1
BioInitiative Working Group (international team of scientists that reviews data from over 2000 studies on the effects of electromagnetic fields) 100 1
Levels in nature <0,0002 <0,000002
ELECTRIC FIELDS
SCIENTIFIC BODY Proposed safety limit
in V/m in mVolt
ICNIRP (International Commission for the Protection against Non-Ionizing Radiation Protection) 5000  
NCRP = National Council Of Radiation Protection and Measurement = National Council on Radiation Protection US (Non-validated scientific panel's recommendations NCRP - Scientific Committee 89-3 Report on Extremely Low Frequency Electric and Magnetic Fields) 10  
TCO = Ecological Model for electronic devices (distance 30 cm) 10  
argeTQ = green Austrian residential certificate 10  
ÖKOPASS = residential certification, Austrian Institute of Biology Building (IBO) 10  
Austrian Medical Association 1,5  
German Building Biology Institue IBN (Institut für Baubiologie + Ökologie Neubeuern - Recommendations for the bedrooms) 1,5 100
Levels in nature <0,0001  

Generally, the recommended exposure limits are below 200 nT (=2mG) for magnetic fields and below 10 V/m for electric fields.

The average exposure of the population is 70nT (= 0,7mG) in Europe and 110nT (=1,1mG) in the US (World Health Organization, Electromagnetic fields and public health, Exposure to extremely low frequency fields).

Our opinion is that any values> 300 nT and >50V/m are quite high.

Ideally we should record values <200 nT and <10 in all areas and <100nT and <2V/m in bedrooms at night.

Detailed information about the proposed and permitted levels can be found in our article "Safe Exposure Limits' .

Signal

Some meters dont explain what exactly they measure so they either mean the instant or average value.

Many meters measure the RMS value (= root mean square = the square root of the arithmetic mean of the squares of the samples) meaning the average.

Meters that measure “true RMS” give more accurate readings than those that measure simple RMS.

Peak and peak hold measurements are not so important for low frequency fields.

Data logging

This feature is very helpful for magnetic field measurements (not for electric field measurements) which vary greatly in time, due to the electrical load fluctuation on the power lines.

For example when measuring magnetic fields near a low voltage power line you might record 1mG in one minute and 3mG after a few seconds.

A meter that records and stores data at least for 24 hours helps you calculate your exposure more accurately and compare it to the safety limits which refer to 24 hour average exposure.

Some meters also offer a data logging PC software that helps you see which hours of the day have the highest magnetic fields and other statistical values.

Display

A digital display gives you more accurate readings and has a more modern and professional look. Analogue displays are rather outdated, but are usually cheaper and will also do the job.

Backlight display

Not a necessary feature but is helpful when measuring in dark areas or in houses with no working lights.

Audio signal

Having audio signal which increases volume according to the radiation value, is helpful for finding radiation hotspots but is not necessary in our opinion for low frequency meters (it is more useful for high frequency meters).

Audio alarm

Audio alarm is helpful for finding radiation hotspots but not necessary when you have audio signal. Some meters also allow you to set the alarm threshold.

Accuracy

Higher accuracy is good but it is more important for professional users and not for amateurs. Also, manufacturers show their accuracy data in various ways, making it difficult to distinguish the ones with crappy accuracy.

Batteries and battery life

If you plan to use the meter a lot then you should definitely take into account the battery type and life of the batteries used, because changing batteries frequently could elevate the operating cost significantly. Some meters are rechargeable so you don’t have to purchase new batteries every little while.

Low battery indication

Warns you about low battery so it helps you not run out of batteries unexpectantly.

Auto power off

Helps you avoid battery loss when you accidentally forget the meter on.

Carrying case

A good quality plastic case is very helpful for professionals or for those who frequently measurements in various locations.

Calibration service

If you need to check that everything works well in the future you might consider sending it for calibration (or recalibration if the meter was originally calibrated). This is especially important for professional users. In that case you should choose a manufacturer that offers this service. Also it would be better if the manufacturer is geographically close to you.

Warranty

The longer the warranty the better, especially if the meter is expensive.

Seller

We try to we recommend reputable companies, with good customer service, that can ship the meters worldwide.

Being more geographically close might be helpful if there is a malfunction of the meter, so we usually recommend one seller from the USA and one from Europe.

Also, buying from an overseas company means there will be some extra shipping costs and possible tax charges in the customs office.

Finally, please be sure to check all the mentioned features (warranty, prices etc) also in the sellers page, because they could be different from those mentioned in the following comparison tables or have changed since the time this article was written.

Are magnetic field measurements more important than electric field measurements?

  • Low frequency magnetic fields have been listed as “possible carcinogens” by the IARC (WHO), unlike low frequency electric fields.
  • Magnetic fields penetrate all areas since they are unaffected by most building materials, while electric fields from power lines, transformers etc do not penetrate interior areas because they are grounded by most building materials.
  • While you can make a good guess about the levels of electric fields in an indoor area (high values usually only near electrical devices which are not grounded), it is difficult to estimate magnetic fields of seemingly similar radiation sources. Also, the sources of magnetic fields vary greatly and are much more often not visible.
  • High values of magnetic fields are usually difficult and expensive to reduce, so it is much more important to measure them especially before buying a new property, while electric fields are much easier to reduce.
  • While it is easy and affordable to perform accurate 3-D magnetic field measurements (triple axis magnetic field meters come with a reasonable price) the majority of electric field meters are only single axis, so are more difficult to use and triple axis electric field meters are few and very pricey.

What are the main categories of magnetic field meters?

The main feature that distinguishes magnetic field meters is whether they have a single axis or 1D sensor or triple axis or 3D sensor.

Triple axis meters are more expensive than single axis meters but the price difference is justified in our opinion.

Meters with a single axis or 1D sensor can measure only in one direction at a time, so in order to measure the total radiation you will need to measure separately in each of the three axes by rotating the meter accordingly and then calculate the vector sum or find the axis with the maximum value to roughly find the total value.

3-axis meters on the other hand calculate directly the total three-dimensional value. A 3-axis meter is much easier to use and helps you perform quicker and more accurate measurements.

The second most important feature is data logging, which means that the meter has the ability to store magnetic field measurements and calculate the average level of exposure at the end of the measurement session.

This feature is also pricey, but again very important, because magnetic field measurements vary greatly in time, due to the electrical load fluctuation on the power lines.

So in order to get a more reliable magnetic field measurement you should better be able to have a meter that records and stores data at least for 24 hours.

What about electric field meters?

There are very few meters that measure only low frequency electric field (such as the Digital Electric Field Meter (Cat. #A152-D) but because their price is high we find no reason to recommend them.

Also, even “electric field only meters” are only single axis.

Many magnetic field meters also offer electric field measurements and have cheaper prices than the “electric field only meters”, so we suggest you choose one of those if you need to also measure electric field meters.

Triple axis electric field meters are even more rare. Gigahertz’s NFA1000 is the only triple axis magnetic field meter which also offers triple axis electric field measurements in that price range.

Some more tips for electric field measurements

Electric fields are affected by all conductive materials such as the human body so it is not technically right to just hold the meter when measuring electric fields (although most manufacturers will not tell you anything about this).

Correct electric field measurements are performed either “potential free” or “grounded”.

“Potential free” measurements are technically more accurate and are performed by placing the meter on a non conductive holder which some companies offer.

“Grounded” measurements are performed by connecting the electric field meter to the earth pin of the electrical outlet or to metal piping or to outdoors soil (ask an electrician).

Grounded measurements are usually ~5 times higher than potential free ones.

Alternatively you can measure Body Voltage instead of electric field intensity by connecting a multimeter with the electrical ground and our body. The Body Voltage measurements are simpler and have the advantage that they show a total direct voltage value which is representative of the influence of the electric field in the whole body and not only in specific locations. See Body Voltage meters sold by Amazon, Less EMF.

Should my meter also measure DC fields?

The meters presented on this page measure AC (alternative current) magnetic fields created by power cables, transformers, electrical appliances etc.

DC (direct current) magnetic fields are created by the earths magnetic field, by magnetic scanners, tomographers, subwoofers, magnetized metal etc.

If you need only to detect the DC magnetic fields in order to avoid them (which is usually the case) you do not need to buy a DC field meter. A magnetic compass will detect any presence of artificial magnetic fields which interferes with earth’s magnetic field and deviates the reading of the compass. So if there is an artificial DC field, the needle of the compass, which normally points to the real magnetic north, will change direction.

If you need to measure DC fields, have in mind that most DC meters out there are single axis which makes the measurement even more difficult.

Some tips for professional users

  • There are meters in the market that are targeting professional users and are priced very high, though they seemingly offer the same features.
  • Some times, the increased price is justified by some extra features such as frequency analyzing, higher accuracy, data logging capability etc. Make sure you really need those features before you spend extra money on them.
  • On the other hand, more expensive meters usually also mean higher overall quality, more professional design, longer and more reliable operation, longer warranty, better service and the potential to get your meter recalibrated, which are important for professional users.
  • And your clients will value your service more if you use a high end meter, rather than a cheap one.
  • We suggest you try to avoid all in one combination meters. They do not perform well in all types of measurements.
  • Also, using more meters will make a better impression to your clients, than doing all the measurements with only one meter.
  • While smaller and lighter meters are easier to transport, bigger and heavier meters look and feel more professional.

Check all low frequency meters in the comparison tables below:

Single axis magnetic field meters 

Basic magnetic field meters which can measure only in one direction at a time. Some of the meters presented also measure electric fields (single axis).

  •   Model
  •   Manufacturer
  •   Average price
  •   Review
  •   Antenna/Sencor
  •   Low frequency range (Hz)
  •   High frequency range (MHz)
  •   Units of measurement
  •   Measurement range low frequency magnetic field
  •   Measurement range low frequency electric field
  •   Measurement range high frequency electromagnetic field
  •   Signal
  •   Data logging
  •   Display
  •   Backlight Display
  •   Audio signal
  •   Audio alarm
  •   Accuracy
  •   Battery type
  •   Battery life
  •   Low battery indication
  •   Auto power off
  •   Carrying case
  •   Calibration service
  •   Warranty
  •   Instructions of use
  • Gauss Master
  • Unknown (China?)
  • $35
  • The cheapest single axis magnetic field meter with analogue display!
  • Single axis low frequency magnetic
  • 30 - 400
  • mG, μΤ
  • 0.1 -199.9 mG or 10-199900nT
  • Analogue
  • 4% ±3 digits at 50/60 Hz
  • 9V (not included)
  • 30 days from Lessemf
  • EMF 822-A
  • Lutron Electronic Enterprise Co. Ltd. (Taiwan)
  • $80
  • The cheapest single axis magnetic field meter with digital display!
  • Single axis low frequency magnetic
  • 30 - 300
  • mG, μΤ
  • 0.1 -199.9 mG or 10-199900nT
  • Digital
  • 4% ±3 digits at 50/60 Hz
  • 9V (not included)
  • 1 year
  • GM3120
  • Benetech - Shenzhen Jumaoyuan Science and Technology Co. Ltd (China)
  • $50
  • The cheapest single axis magnetic and electric field meter!
  • Single axis low frequency magnetic / Single axis low frequency electric
  • 5-3500
  • μΤ, V/m
  • 10-19990nT
  • 1-1999 V/m
  • Digital
  • 6F22 9V battery
  • 30 days from EMFields
  • ED-88T
  • CORNET Microsystems Inc. (USA)
  • $190
  • The cheapest single axis magnetic and electric field meter which also measures high frequency (wireless) electromagnetic fields! According to the WILA Bonn report though, another Cornet meter, the ED78S, greatly exaggerates its high frequency range and accuracy. Also, measurement values are dependent on how meter is held and sometimes show extreme underestimation of exposure levels at higher signal strengths..
  • Single axis low frequency magnetic / Single axis low frequency electric / Single axis high frequency electromagnetic
  • 50-10000
  • 100-8000
  • mG, μΤ, dBm, V/m, mw/m²
  • 0.014 - 26.2 V/m or 0.52- 1800000μW/m2
  • 0.014 - 26.2 V/m or 0.52- 1800000μW/m2
  • 0.014 - 26.2 V/m or 0.52- 1800000μW/m2
  • Peak
  • Digital
  • RF: +/- 3.5dBm, LF: 20%, E-field: 25%
  • 9V alkaline battery or 9v Li-ion rechargeable battery (not included)
  • >20 hours
  • 30 days from Lessemf

Triple axis magnetic field meters 

Advanced magnetic field meters which calculate directly the total three-dimensional value and are very easy to use. Again, some of the meters presented also measure electric fields (single axis).

  •   Model
  •   Manufacturer
  •   Average price
  •   Review
  •   Antenna/Sencor
  •   Low frequency range (Hz)
  •   High frequency range (MHz)
  •   Units of measurement
  •   Measurement range low frequency magnetic field
  •   Measurement range low frequency electric field
  •   Measurement range high frequency electromagnetic field
  •   Signal
  •   Data logging
  •   Display
  •   Backlight Display
  •   Audio signal
  •   Audio alarm
  •   Accuracy
  •   Battery type
  •   Battery life
  •   Low battery indication
  •   Auto power off
  •   Carrying case
  •   Calibration service
  •   Warranty
  •   Instructions of use
  • MT-263
  • Magnii Technologies (USA)
  • $260
  • The cheapest triple axis magnetic field meter with analogue display!
  • Triple axis low frequency magnetic
  • 15-5500
  • mG, μΤ
  • 0.01-250mG or 1-25000nT
  • True-RMS + Max Hold
  • Digital
  • ±(4% + 4 digits) from 48 to 62 Hertz
  • 9v alkaline battery (included) You can also buy AC to 9V DC Adapter for A107 (Cat. #A174-9) ............ $12.95
  • Approximately 15 hours
  • 18$ hard plastic case from Magniie Technologies (Case dimensions are 10.69" x 9.52" x 3.36" and features pluck-foam so you can customize it to hold any of your equipment!)
  • Can be recalibrated for $50. Magniie uses digital calibration methods that don't drift with normal operation, so typically recalibration isn't necessary unless the unit has been damage.
  • 2 years
  • DSP-523
  • Magnii Technologies (USA)
  • $290
  • Similar to the Magnii 263 with extra analysis of dirty electricity and harmonics. Allows you to isolate or ignore power line frequencies at 50 (Europe) or 60 Hz (North America) or measure non-power line related fields without distortion from power line fields (including harmonics) or accurately measure power line fields without any distortion from other field sources. Not sure if you need all of these though.
  • Triple axis low frequency magnetic
  • 30-300
  • mG, μΤ
  • 0.01-250mG or 1-25000nT
  • True-RMS + Max Hold
  • Digital
  • ±(4% + 4 digits) from 48 to 62 Hertz
  • 9v alkaline battery (included) You can also buy AC to 9V DC Adapter for A107 (Cat. #A174-9) ............ $12.95
  • Approximately 20 hours
  • 18$ hard plastic case from Magniie Technologies (Case dimensions are 10.69" x 9.52" x 3.36" and features pluck-foam so you can customize it to hold any of your equipment!)
  • Can be recalibrated for $50. Magniie uses digital calibration methods that don't drift with normal operation, so typically recalibration isn't necessary unless the unit has been damage.
  • 2 years
  • Trifield 100XE
  • Alphalab (USA)
  • $150
  • Cheap combination meter (Triple axis low frequency magnetic – Single axis low frequency electric – Single axis high frequency electromagnetic). It is kind of worthless as a high frequency meter because it only detects vey high radiation values, so the Tri-field name is rather misleading. Also it has an analogue display and outdated look.
  • Triple axis low frequency magnetic / Single axis low frequency electric / Single axis high frequency electromagnetic
  • 40-100000
  • 50-3000
  • mG, V/m, mW/cm2
  • 0.2 -100 mG (=20-10000nT)
  • 5-1000 V/m
  • 100000-10000000μW/m2 VERY HIGH VALUES-NOT RECOMMENDED FOR HIGH FREQUENCY MEASUREMENTS
  • Analogue
  • +/- 20% of reading for low frequency magnetic, +/- 30% of reading for low frequency electric, ½ x to 2 x of reading for high frequency electromagnetic
  • 9V battery
  • ~40 hours
  • 1 year limited warranty from EMFields
  • Trifield Broadband 100XE
  • Alphalab (USA)
  • $190
  • More or less the same as the 100XE model, but with a difference in high frequency range (0.1-2500 MHz compared to 50-3000MHz for the 100XE) so it can also detect some type of radio transmitters the 100XE can’t. ). This model is also kind of worthless as a high frequency meter because only detects vey very high radiation values for high frequency fields, but again it has good value because of the low frequency measurements it offers.
  • Triple axis low frequency magnetic / Single axis low frequency electric / Single axis high frequency electromagnetic
  • 40-100000
  • 0.1-2500
  • mG, V/m, mW/cm2
  • 0.2 -100 mG (=20-10000nT)
  • 5-1000 V/m
  • 10-1000 V/m (= 265251-2652519893μW/m2) VERY HIGH VALUES-NOT RECOMMENDED FOR HIGH FREQUENCY MEASUREMENTS
  • Analogue
  • +/- 20% of reading for low frequency magnetic, +/- 30% of reading for low frequency electric, +30% to -25% for high frequency electromagnetic
  • 9V battery
  • ~40 hours
  • 1 year limited warranty from EMFields
  • TM-190
  • TENMARS ELECTRONICS CO. LTD, (TAIWAN)
  • $200
  • Cheap combination meter similar to Trifield meters but this is a lot better at measuring high frequency fields. Again, this model also must have its limitations on high frequency measurements, since according to the WILA Bonn report, another Tenmars model, the TM-196, could not detect many sources in the specified frequency range or showed abnormally elevated values...
  • Triple axis low frequency magnetic / Single axis low frequency electric / Single axis high frequency electromagnetic
  • 50-60
  • 50-3500
  • mG, μΤ, V/m, mV/m, V/m, μA/m, mA/m, μW/m2, mW/m2, μW/cm2
  • 0.02-2000mG or 2-200000nT
  • 50-2000V/m
  • 0.02-554000μW/m2 (according to the WILA Bonn report, another Tenmars model, the TM-196, could not detect as low as 3.6 μW/m2 but only from 41 μW/m2, which is not acceptable for Building Biology standards)
  • RMS
  • Digital
  • Magnetic ±(15%+100dgt), Electric ± (7% + 50dgt), Electromagnetic: ± 2dB at 2.45GHz
  • 1.5V AAA Alkaline Battery*3.
  • ~8 hours

 Triple axis magnetic field meters with Data Logging

Triple axis meters which can store magnetic field measurements and calculate the average level of exposure at the end of the measurement session. Some of the meters presented also measure electric fields (single or triple axis!). Our recommendation for low frequency measurements!

  •   Model
  •   Manufacturer
  •   Average price
  •   Review
  •   Antenna/Sencor
  •   Low frequency range (Hz)
  •   High frequency range (MHz)
  •   Units of measurement
  •   Measurement range low frequency magnetic field
  •   Measurement range low frequency electric field
  •   Measurement range high frequency electromagnetic field
  •   Signal
  •   Data logging
  •   Display
  •   Backlight Display
  •   Audio signal
  •   Audio alarm
  •   Accuracy
  •   Battery type
  •   Battery life
  •   Low battery indication
  •   Auto power off
  •   Carrying case
  •   Calibration service
  •   Warranty
  •   Instructions of use
  • TM-192D
  • TENMARS ELECTRONICS CO. LTD, (TAIWAN)
  • $200
  • Cheapest triple axis meter with data logging and PC software! The PC software requires installation and is not good as the Gigahertz NFA software though.
  • Triple axis low frequency magnetic
  • 30-2000
  • mG, μΤ
  • 0.01-2000mG or 1-200000nT
  • Datalogging capacity with Memory Size: 9999 data sets. USB PC interface
  • Digital
  • 20 mG ±(3.0%+30dgt) at 50Hz/60Hz.
  • 9V NEDA 1604, IEC 6F22 or JIS 006P Don't forget the AC to 9V DC Adapter to power this meter for prolonged use: Regulated AC to 9V DC Adapter for A108 (Cat. #A174-9) ............ $12.95
  • ~100 hours
  • EMDEX Mate
  • Enertech Consultants (USA)
  • $569
  • Simple to use triple axis meter which provides the average level of exposure at the end of the measurement session.
  • Triple axis low frequency magnetic
  • 40-1000
  • mG, μΤ
  • 0.1 -1000 mG or 10-100000nT
  • True RMS
  • When data collection is finished the meter shows Time-Weighted-Average (this is the average level of exposure during the measurement period), Minimum and Maximum levels recorded during the measurement period, Standard Deviation, Percent of Time in Six Different Exposure Level Ranges and Cumulative Exposure Time.
  • Digital
  • 1-3%
  • 9 Volt Alkaline or Lithium
  • >50 hours (alkaline battery)
  • Comes with a calibration certificate (NIST Traceable serialized) and can be recalibrated from the manufacturer.
  • 30 days from EMFields
  • NFA30M
  • Gigahertz Solutions GmbH (Germany)
  • $650
  • Best choice for the triple axis magnetic fields measurements. Includes a 4GB memory card and the “no installation needed”, simple to use software NFAsoft which is in our opinion the best for datalogging and analyzing the results.
  • Triple axis low frequency magnetic
  • 16-32000
  • mG, μΤ, nT
  • 0.01-199.90mG or 1 - 19990 nT (up to 400000 nT upon request)
  • True RMS, Peak, Peak Hold
  • Measurement data are recorded in the 4GB SD memory card and can be analyzed though a PC using the NFAsoft application (no installation needed). Can record continuously up to a week with power supply or up to 48 hours without power supply. NFAsoft provides average, minimum and maximum values (total and for each axis separately) and allows you to analyze the much discussed phenomenon of "dirty power (harmonics)" by showing you measurement data for the total 16-32000Hz frequency range, and for 16Hz, 50/60Hz, 100-120Hz (2nd harmonics), 150-180 (3rd harmonics),<2000Hz and >2000Hz
  • Digital
  • 50 / 60 Hz: +/- 5 % 16 Hz - 30 kHz: +/- 1 dB Isotropic deviation: +/- 1,5 dB Offset +/- 3 Digits
  • Rechargeable 7.4-Volt Li-ion high quality battery pack (included) Power supply unit included
  • ~48 hours in logging mode
  • Gigahertz plastic transport case K5 (approx. 27 x 18 x 8 cm) with foam filler inserts
  • 2 years
  • NFA400
  • Gigahertz Solutions GmbH (Germany)
  • $1200
  • Similar to the NFA30M but also offers single axis electric field measurements.
  • Triple axis low frequency magnetic / Single axis low frequency electric
  • 5-400000
  • mG, μΤ, nT, V/m
  • 0.01-199.90mG or 1 - 19990 nT (up to 400000 nT upon request)
  • 0.1-1999Vm (+ 1 - 19,990 mV for Body Voltage Measurements)
  • True RMS, Peak, Peak Hold
  • Measurement data are recorded in the 4GB SD memory card and can be analyzed though a PC using the NFAsoft application (no installation needed). Can record continuously up to a week with power supply or up to 48 hours without power supply. NFAsoft provides average, minimum and maximum values (total and for each axis separately) and allows you to analyze the much discussed phenomenon of "dirty power (harmonics)" by showing you measurement data for the total 16-32000Hz frequency range, and for 16Hz, 50/60Hz, 100-120Hz (2nd harmonics), 150-180 (3rd harmonics),<2000Hz and >2000Hz
  • Digital
  • 50 / 60 Hz: +/- 5 % 16 Hz - 30 kHz: +/- 1 dB 5Hz - 400 kHz: +/- 2 dB Isotropical deviation: +/- 1.5 dB Offset +/- 5 Digits
  • Rechargeable 7.4-Volt Li-ion high quality battery pack (included) Power supply unit included
  • ~36 hours in logging mode
  • Gigahertz plastic transport case K5 (approx. 27 x 18 x 8 cm) with foam filler inserts
  • 2 years
  • NFA1000
  • Gigahertz Solutions GmbH (Germany)
  • $1900
  • Our top recommendation for low frequency measurements! The only triple axis magnetic field meter which also offers triple axis electric field measurements in that price range.
  • Triple axis low frequency magnetic / Triple axis low frequency electric
  • 5-1000000
  • mG, μΤ, nT, V/m
  • 0.01-199.90mG or 1 - 19990 nT (up to 400000 nT upon request)
  • 0.1-1999Vm (+ 1 - 19,990 mV for Body Voltage Measurements)
  • True RMS, Peak, Peak Hold
  • Measurement data are recorded in the 4GB SD memory card and can be analyzed though a PC using the NFAsoft application (no installation needed). Can record continuously up to a week with power supply or up to 48 hours without power supply. NFAsoft provides average, minimum and maximum values (total and for each axis separately) and allows you to analyze the much discussed phenomenon of "dirty power (harmonics)" by showing you measurement data for the total 16-32000Hz frequency range, and for 16Hz, 50/60Hz, 100-120Hz (2nd harmonics), 150-180 (3rd harmonics),<2000Hz and >2000Hz
  • Digital
  • 50 / 60 Hz: +/- 5 % 16 Hz - 30 kHz: +/- 1 dB 5 Hz - 1000 kHz: +/- 2 dB Isoptropic deviation: +/- 1.5 dB Offset +/- 5 digits
  • Rechargeable 7.4-Volt Li-ion high quality battery pack (included) Power supply unit included
  • ~48 hours in logging mode
  • Gigahertz plastic transport case K5 (approx. 27 x 18 x 8 cm) with foam filler inserts
  • 2 years

Why you should pay attention to our recommendations

Home Biology is run by engineers who perform electromagnetic radiation measurements for a living.

We know what features you to need to look for when buying an EMF meter, so that you can easily and reliably take the necessary measurements, without overspending.

We recommend EMF meters that offer all the basic features with a reasonable price, are simple to use, have easy to read English manuals and/or videos and are sold by trusted sellers.

This website is affiliated with the sellers presented, meaning that we earn a commission every time someone buys a meter coming from our website. This does not in any way affect our judgment when choosing the meters to recommend. Those sellers sell also many other meters which we do not recommend because they do not fill our criteria.

Found another meter?

Please check before you buy if this meter fills all the criteria mentioned here. The frequency range, the measurement span etc. Since we frequently scan the market for new meters it is likely that we have rejected this meter for some reason.

For example, we do not include the popular Trifield meters in the high frequency section because they can only detect very high radiation values. We recommend them only as low frequency meters.

In case you find a meter that does tick all the boxes and has a lower price go ahead and buy it! And we would appreciate if you would let us know so we can add it to our catalogue.

 

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How to measure electromagnetic radiation

Why buy an EMF meter? How to choose the right one - Which features to look out for and for which you should avoid overpaying - How to use the meter - Is there a device that measures all types of radiation? Are radiation measurements only needed when there is a significant radiation source nearby? Which radiation values are considered high and where are they usually recorded?

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