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best value emf meter
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Top of the Line
ESI-24 Combination Meter

Cemprotec 31

Low cost and easy to use

$99.95  :  add to cart

Safe and Sound Pro II

Safe and Sound Pro

Sophisticated and Simple

$385.00  :  add Safe and Sound Pro to cart

How do I measure RF: To measure RadioFrequency radiation (what some people mean when they say "RF" or "Microwaves") from wifi (wireless internet or wireless router), cell phones or cell towers, laptops or microwave ovens and Smart Meter Radiation, we use a Radio Frequency Meter. RF meters measure the strength of the radiation at the location of the meter. Because radiowaves are oriented in space, the position of the meter will affect the reading (see discussion of 1 axis vs. 3-axis meters). RF meters can also be used to locate the source of a field, and to measure the performance of radiofrequency shielding.

The main features to consider when choosing an RF meter are:
    - Readout type: lights, sound, numbers, needle gauge
    - Range: how sensitive on the low end, and the upper limit on the high end
    - Axis: 1-axis only, 3-axis only, switchable 1-axis and 3-axis
    - Accuracy: While high accuracy is desirable, it is not often necessary for locating "hot spots".
    - Outputs: voltage output or PC interface for data logging
    - Other features: alarm, memory, spectrum analysis, etc.

Interested in measuring 5G frequencies" See this short discussion of what that involves.

More Great Choices... Click below to order or more information

High Frequency Meter

High Frequency Meter
Directional, Accurate

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Simplicity Without Compromise

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Extended Range High Frequency Meter

Extended Range
High Frequency Meter
Covers Wider Frequency Range

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RF Explorer 6G Combo

RF Explorer 6G Combo
Affordable Spectrum Analysis

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Smart Meter


Calibrated, Directional, Accurate, Sensitive
This is the Recommend Meter for Checking "Smart Meter" Emissions

High Frequency Meter

We like this calibrated wideband (800 MHz - 2.5 GHz) RF meter because it has a switch which allows a choice of peak or average indication mode. This permits accurate measurement of both digital and analog signals. Two ranges: 1 - 1999 µW/m² (same as 0.1 - 199.9 nW/cm²) and 0.1 - 199.9 µW/m² (same as 0.01 - 19.99 nW/cm²).

In addition, you get a choice of audio tone - none, or intensity proportional to field strength, or proportional to frequency (for analyzing pulsed signals)
- accuracy ±6 dB
- true logarithmic - periodic antenna, 800 MHz - 2.5 GHz, single polarized, included
- standard 9V battery included

The display on the HF35C updates every 0.5 second. The fastest pulse it can detect is 0.5 micro seconds.
When in peak mode, the display averages all peaks within ½ of a second. The average peak is displayed on the display.
In RMS mode it displays the true average of all signals during that ½ second period. This reading is much lower than Peak mode when measuring a digital signal.

With Optional Near Field Antenna this emf meter can be used as a near field meter capable of measuring smart meter shields, router shields and cellphone shields as well as demonstrating the shielding effectiveness of rf shielding fabrics.

Easily detects cell phone towers, cordless phones even microwave oven leaks. Instructions in German and English. The 3 minute YouTube video at right demonstrates how the sounds from this meter help distinguish different sources of RF (video sound starts after 19 seconds).
2 year Warranty. Model HF35C.

Link here to Smart Meter shielding options.

High Frequency Meter (Cat. #A481) ........ $389.35 add to cart

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Extends Dynamic Range of High Frequency Meter

Is the High Frequency Meter too sensitive for your application? This Attenuator reduces sensitivity by a factor of 100 so you can measure stronger RF signals. This is a great emf radiation measurement tool as it will provide a more accurate number as you get closer to smart meter radiation. Changes sensitivity range from 0,1-1999 µW/m² to 10-199,900 µW/m² (equivalent to 0.001-19.99 µW/cm²). Need to go still higher" Stack as many as you like to achieve the desired range. Designed specifically for the High Frequency Meter (Cat. #A481). This 20 decibel attenuator inserts between antenna and meter body.

20 dB Attenuator (Cat. #A485) ...... $69.95 add to cart

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Extended Range High Frequency Meter Extended Range High Frequency Meter


Great for measuring RF Signal Strength

Just like the High Frequency Meter above but examines 27 MHz - 3.3 GHz, with residual sensitivity to 6 GHz. Includes both a directional and an omni-directional antenna. Model HFE35C.

Extended Range High Frequency Meter (Cat. #A483) ........... $978.35 add to cart

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Safe and Sound Pro II

Safe and Sound Pro II

The New Standard, Ready for 5G

A reliable, accurate device, this professional quality meter is made to be extra simple to use! The premium OLED display will simultaneously show you peak, max, and average, along with a bar graph from left to right! Just above the display, there are indicator lights showing "slight, moderate, high, extreme"! Only 3 controls! The switch on the left controls the power, turning the meter and the sound on and off. The switch on the right provides volume control, and the button on the left resets the max reading. Measures with a true plus/minus 6dB response from 400 MHz to 7.2 GHz, and a full response from 200 MHz to 8 GHz, covering 3G, WiFi, 4G, along with low-band and mid-band 5G! Has a Micro USB port to add power and measure continuously! Even has a headphone port so you can listen privately, or hook it into an amplifier for everyone to hear. Uses 2 AA batteries (included). Also includes Building Biology guidlines sheet, certificate of calibration, and a hard shell molle case. 2 year warranty.

  • Range (Peak Display): 0.001 - 2,500,000 µW/m²
  • Battery life: Up to 18 hours continuous with normal alkaline battery, and the speaker off. 15 hours with the speaker on.
  • Size 7 inches high 4.5 inches wide 1.5 inch deep, ; Weight: 10 oz with battery

Safe and Sound Pro II (Cat. #A40491) ............................ $385.00 add to cart

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Safe and Sound Classic II

Safe and Sound Classic II

Low-Cost, Easy-use, Now with More Lights and Louder Sounds

Designed for people with EHS, this easy to use device provides reliable detection of RF between 200 MHz and 8 GHz. This is so easy, that no technical experience is required to use it, or interpret the readings. Eight simple lights provide detection of RF levels in accordance with the Building Biology sleeping area guidelines. The only control is a switch on the left side turns the device power and sound on or off. It's even designed to produce extra-low emissions from the internal electronics! Includes hard-shell molle case with zipper, instruction manual, and certificate of calibration. Requires 2 AAA batteries (included). 2 year warranty.

This newly updated model has a bunch of new features:

  • More lights for more accuracy
  • More sounds for more accurate source pinpointing
  • Bigger speaker for louder sounds
  • Longer battery life

Safe and Sound Classic II (Cat. #A40490) ............................ $159.00 add to cart

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ACOUSTICOM2 Simplicity Without Compromise

A reliable meter with an economy price. Great for checking radiowaves from smart meters, wi-fi, cellphones and towers, and just about every RF source you are likely to encounter at home or in the office. Covers an amazing 200 - 8000 MHz with ±6dB accuracy. 8 LED light bar indicates field strength in V/m so it is very easy to interpret and has a very fast reaction time. Best of all, it has a dual sound feature which you can turn off if you want: Demodulated sounds allow you to hear intensity, and with a small amount of practice, you can determine what type of device is creating the microwave signal. Plus, an "alarm" sounder which emits a pulsing warning at higher exposure levels.

The internal antenna is at the upper back of the case. Signals are best measured when the source is behind the instrument. Uses one 9V battery, included. Pocket sized and light-weight. Perfect for sniffing out wireless surveillance cameras and spy bugs.

  • Range (Peak Display): 0.01 - 6.00 volts per meter (V/m)
  • 0.01 0.02 0.05 0.1 0.3 1.0 3.0 6.0 V/m increments; (0.5 to 100,000 µW/m²)
  • Power draw: 40 to 90 mA (depends on the sound volume)
  • Battery life: Up to 10 hours continuous with normal alkaline battery
  • Size (mm): 110 x 63 x 21 (LxWxD); Weight: 140g incl. battery

Acousticom2 (Cat. #A140) ............................ $200.00 add to cart

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RadAware Personal Microwave Exposure Alarm


Personal Microwave Exposure Alarm

Ever walk into a store and wonder how much microwave radiation you are being exposed to" Or how about when you are driving around town, or riding on a bus? Or when passing through an airport? Or when you are visiting a friend? It's not always convenient to carry your RF meter, or maybe it's not safe to keep watching it (especially when driving!). RadAware is not a meter, it is an RF exposure alarm. It sends out an audible tone when you enter an area of radiation. The alarm threshold is adjustable so you can match the device's response to your body's sensitivity. And at every setting, there are 6 levels of alarm: low, low+, medium, medium+, and high, high+ dosage so you can quickly know if you are moving toward or away from a high exposure area.

The most sensitive setting is a tiny 1 µW/m² and the least sensitive is 25,000 µW/m² so you have plenty of flexibility. The sound can be turned off, and there are also 3 LED lights which also indicate the 3 levels of exposure. The main detection frequency range is 200 MHz to 6 GHz. This covers the bands where 5G frequencies will be initially. After about 2020 higher-frequencies (mm-waves) will start to be rolled-out for high-density city areas. If used 24 hrs/day, the battery life is 8-12 days on a standard 9V alkaline battery and about half that on a re-chargeable, provided that it is not regularly sounding an alarm.

RadAware (Cat. #A137) ................ $170.00 add to cart

Video showing how to use this meter

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Cemprotec 31 RF Detector

Cemprotec 31

Ultra Simple Meter for Wireless Signals

So simple to use, the Cemprotec 31 easily measures radiofrequency radiation from wireless technologies such as WiFi, DECT phone, wireless security alarms, wireless doorbell cameras, mobile phone, GSM, smart meters, 3G, 4G, 5G, and even a microwave oven. Indicates field strength with a series of 24 LEDs and sound. LEDs change from green to orange to red. Use it to find hidden sources of RF or to test shielding performance. No external antenna or knobs to break off. Its German-made quality and attractive price makes it one of the best economy RF detectors on the market. Covers 1 MHz to 10 GHz. Uses one 9V battery (included), and has a 1 year warranty. Best of all, it costs less than $100!

Cemprotec 31 (Cat. #A40501) ............... $99.95 add to cart

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For RF Measurements Close to the Source Near Field Antenna

Can be used with 6 GHz Basic RF Meter or High Frequency Meter (or other RF meter with SMA connection) to measure the magnetic field component of the signal in the near field (up close to the source of radiation). Useful from 1 MHz to 7 GHz with a high gain averaging 30 dB. Great for checking cell phones, wifi, DECT, Blue Tooth and more. Also useful for checking the near field shielding effectiveness of your shielding items (such as cell phone shields, wifi router guards, Smart meter shields and Computer Monitor Radiation Shields...). SMA connector, 50 Ohm impedence. Meter not included.

Works well with: (may need adapter)
- RF Explorer
- High Frequency Meter

Near Field Antenna (Cat. #A198) ............ $49.95 add to cart

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ACOUSTIMETER (Model AM-11) - NEW and Improved!!

Smart Meter

The most comprehensive RF Radiation Meter available today

The Acoustimeter is a user-friendly accurate RF measurement instrument which provides LED light and LCD text displaying peak, peak hold, and average levels of radio frequency electromagnetic fields, covering the spectrum from TETRA all the way up to and beyond the 5.6 GHz WiFi and WiMax frequencies. It has a digital readout which is sensitive 0.02 V/m - 6.00 V/m and a sound output enabling you to hear the signal modulation. These features make the instrument the most useful one available to even those with severe electrosensitivity.

The Acoustimeter has been designed to enable you to make a quick and informed judgment regarding the level and nature of microwave signals in your environment. It is a broadband instrument that accurately measures the totality of the radiation in the range 200 MHz to about 8000 MHz (8 GHz), which covers the frequencies used by most modern communication systems encountered in our everyday environment. The Acoustimeter was designed using the experience gained from many years of practical RF and microwave measurements.

With the initial rollout of 5G, many of the frequencies used will still be under 6 GHz. Most of our meters have been able to test in the 5G frequency upto 6 GHz. We are currently in the process of developing affordable 5G meters, to measure frequencies in the higher ranges expected for future 5G technologies

The readings are shown on both an LCD display and two series of graduated LED lights. The LEDs update rapidly and allow you to quickly gauge the levels in an area and find any hot-spots. The LCD display offers high accuracy with a lower update speed, giving you time to take note of the readings. It also has a speaker (and audio output socket for headphones or to feed to an audio recorder), allowing you to determine, with a small amount of practice, what type of device is creating the levels that are present. The sounds made by different transmitters can change with time, so these are meant as a rough guide only. If you are subject to a number of sources of RF, the sounds may intermingle and be less easily identified. 5 year return-to-base warranty, details are in the User Manual.

The Acoustimeter is useful in learning how to measure Radio and Micro Wave Frequencies. With all the information this meter provides to you it won’t be long before you are an EMF Expert.

The internal PCB antenna is at the top rear of the case. Signals are best measured with the source behind the instrument, but also quite good with the source to one or other side (particularly the left side away from the switches and volume control). It under-reads if the source is in front of the meter as the LCD display acts as an RF screen.

Link here to
Smart Meter shielding

Technical specifications

  • Two line LCD displaying actual levels:
      » Peak exposure levels in V/m
      » Peak hold levels in V/m
      » Average exposure levels in µW/m2
  • Two lines of LEDS displaying actual levels:
      » Peak exposure levels in V/m
      » Average exposure levels in µW/m2
  • Measurement range: 200 - 8000 MHz ±6 dB
  • Sensitivity* (Peak Display): 0.02 V/m - 6.00 V/m
  • Sensitivity* (Average Display): 1 µW/m2 - 100,000 µW/m2
  • Pulsing signal may be heard through the internal speaker
  • Power source: 2x AA Alkaline or Rechargeable (1.2 - 1.5V)
  • Power draw: 100-150 mA at 3 V
  • Battery life: 15 hours
      » Typically 15 hours on two new 1500 mAhr AA alkaline cells and
      » Typically 25 hours on two charged 2700 mAhr NIMH rechargeable cells
  • Size (mm): 190 x 102 x 33 (LxWxD)
  • Weight: 280g, excluding batteries
Short video from YouTube showing
Acoustimeter in use:

Acoustimeter AM-11(Cat. #A40138) ..................... $420.00 add to cart

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2.45 GHz Meter for Microwave Ovens

High Precision, Professional Quality

This RF meter is specially designed for measuring or monitoring RF emissions from microwave ovens reliably. Calibrated specifically for the 2.45 GHz frequency range used by ovens.

Measurement range 0 to 1.999 mW/cm² with 0.001 resolution. Built in audible alarm at 1 mW/cm². Best of all, the sensor is located 5 cm (2 inches) from the top of the unit so it completely takes the guesswork out of where to position the meter. Simply touch the top of the meter to the oven door/seal/window and make accurate, repeatable readings. Includes Peak Hold feature to capture the highest reading.

Will also measure 2.45 GHz (±50 MHz) frequencies from other analog signal sources. Has residual sensitivity from 30 MHz to 3 GHz so other frequencies can be detected, but for reference only. Requires one 9V battery. 1 year wty.

2.45 GHz Meter for Microwave Ovens (Cat. #A109) ............. $109.95 add to cart

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RF Explorer 6G Combo

RF Explorer® 6G Combo

Affordable Spectrum Analysis

We couldn't believe our eyes when we saw what this beauty can do: display frequency spectrum, including carrier and modulated wave, display Spread Spectrum activity if that exists, and show bandwidth to monitor frequency crowding, frequency deviation from expected, etc.

What does that mean" It means you can see what frequencies are present and the strength of each signal. Check cell phones, wi-fi, cordless phones, FM radio, CB radio, and a wide range of other wireless signals. Covers Frequency band: 15 MHz-6.1 GHz (1kHz resolution), and with excellent dynamic range. Currently capable of measuring the low end of the 5G frequencies. High capacity Lithium polymer (included) for 16+ hours of continuous run, rechargeable by USB. Peak Max and Hold, Normal, Overwrite and Averaging modes. Can even connect to your PC (PC Windows client supports Windows XP/Vista/Win7/10 both 32 and 64bits)! Lifetime free firmware upgrades. Pocket size and light weight, completely portable, solid aluminum metal case. 2 year warranty. Two separate inputs and three antennas supplied: a wideband telescopic antenna for all sub-GHz frequencies, a rubber duck 5.8 GHz and a whip helical for 2.4GHz band. Additional, specific band antennas may be needed to efficiently cover some of the frequencies supported.

Very sensitive, Avoid over-ranging near strong transmitters.
Download user manual and software

RF Explorer® 6G Combo (Cat. #A197-6) ............... $425.00 add to cart

What our customers tell us:

"I needed a way to track down the source of EMI/RFI that was disturbing my personal audio equipment and my clients recording studio equipment. My RF Explorer-3G Combo has done an excellent job for me with this particular task. This value packed, handheld RF spectrum analyzer has more than met my expectations, considering its modest price."

F.L., Broomall, PA

Deluxe Instrument Case


Perfect for meters, instruments or cameras. Fits plenty of stuff in a compact space. This rugged case features aluminum trim, riveted corners, lock and keys, carry handle and metal hinges. Black hard sidewalls. Black padded inside walls but no foam. Outside: 12'' x 10'' x 4''; Inside: 11" x 9¼" x 3¼".

You can also use it to store:
important papers seeds toiletries knitting / sewing supplies
crayons / chalk photos coupons medicines / vitamins / homeopathy
hand gun / ammo tools collectibles art / craft supplies
cash / valuables diary love letters small toys, Legos, puzzles
business cards lunch receipts baseball cards

Deluxe Instrument Case (Cat. #P711) .............................................. $19.95 add to cart

Foam Inserts


Sized to Fit Deluxe Instrument Case and Customizable

If you like your equipment cradled in supporting foam, these pre-scored foam inserts fit perfectly in the Deluxe Instrument Case above. You get 3 pieces: Upper egg-crate, lower egg-crate, and a middle customizable 1 inch thick piece with 1/2 inch pre-scored lines. Just trace the outline of your equipment on the back side and punch out as many 1/2 inch squares necessary to cradle the equipment perfectly. Even the egg-crate pieces can be cut with a scissors or sharp blade. Nice professional look too.

Foam Inserts (Cat. #P712) .............................................. $10.00 add to cart

9v Battery Terminal Adapter

Run your meter on household power for continuous measuring
9v Battery Terminal Adapter

Want your meter to take continuous measurements all day? The answer is here. This 9v Battery Terminal Adapter plugs into any North American wall outlet and connects directly to the locking battery terminal on ANY 9-volt device. Only works with locking 9v battery terminals (see image).

9v Battery Terminal Adapter
9v Battery Terminal Adapter (Cat. #A60172) .......................$8.95 add Personal EMF alarm to cart

Exactly how much is a picowatt?

milliWatt = 10-3 Watt
microWatt = 10-6 Watt
nanoWatt = 10-9 Watt
picoWatt = 10-12 Watt
femtoWatt = 10-15 Watt

Can't decide which meter is right for you"
Click here to go to the handy Meter Selection Guide.

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