To measure RadioFrequency radiation (what some people mean when they say "RF" or "Microwaves") from wifi, cell phones or cell towers, laptops or microwave ovens we use an RF 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
Calibrated, Directional, Accurate, Sensitive This is the Recommend Meter for Checking "Smart Meter" Emissions
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.
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.
High Frequency Meter (Cat. #A481) ........ Was $429.95, On sale now, only: $347.00
High Frequency Meter with Customized Foam Lined Hard Case
Ultimate Protection for Your Investment
The High Frequency Meter has a large and slightly delicate external antenna. You don't want to drop it! In this offer you get the HF35c meter (shown above), plus the Near Field Antenna, 20 dB Attenuator and the protective locking case. Hard sided and foam lined, customized for a perfect fit. With this combination, you can measure both very strong and wek weak signals, in Near Field and Far Field. Great for smart meters, cellphones, wifi and just about any RF measuring application.
High Frequency Meter with Customized Foam Lined Hard Case (Cat. #A481-kit) ........ $495.00
Is the High Frequency Meter too sensitive for your application? This Attenuator reduces sensitivity by a factor of 100 so you can measure stronger signals. 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). Inserts between antenna and meter body.
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, 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)
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? Passing through an airport? Or even 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 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 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. Can also be powered by an AC adapter (sold separately) for prolonged use.
So simple to use, ESI 21 easily measures radiofrequency radiation from wireless technologies such as WiFi, DECT phone, alarm, mobile phone, GSM, smart meters and even a microwave oven. Indicates field strength with a series of 10 LEDs and sound. Two ranges: normal sensitivity and high sensitivity. LEDs change from green to yellow to red. Use it to find hidden sources of RF or to test shielding performance. No external antenna or knobs to break off. Fits easily in a pocket or purse. Its German-made quality and attractive price makes it one of the best economy RF detectors on the market. Covers 50 MHz to 8 GHz. Uses one 9V battery, and has a 1 year warranty. Best of all, it costs less than $100!
This delightful meter measures electric field from 50 Hz to 18 GHz! Telescoping antenna and one button operation provide the simplicity you want, and the logarithmic scale provides the range you need: from tiny 0.005µW/cm² signals to ridiculously high 40mW/cm² blasts. Just turn it on and read off the meter. Needle gauge offers super-fast response, so you can see the pulses from intermittent emitters too.
Perfect for identifying radiation hot spots at home or on the road, and for checking shielding effectiveness. Good quality at a low price! 1 year warranty.
Frequency response: 50Hz to 18GHz
Sensitivity range: 0.005 µW/cm² to 40 mW/cm²
Accuracy: ±10% (50Hz to 10GHz)
Battery life: 9V Duracell, approx 50 hours
18 GHz RF Meter (Cat. #A409) .................. $139.95
What our customers tell us:
"The BEST detector under $500 I could find anywhere! and it shipped super fast! used it for finding bad wires in the wall (huge fire hazard) and finding emf around the house and clients houses. The can opener and unsealed microwaves are the worst! and CFL's Really how is the legal? Anyway this is amazing widest range and it tells you everything you need to know even for a person without lots of electrical understanding!"
J.A., Online customer
Demonstration of this meter with various RF sources
Breakthrough in low cost RF measurement. Covers 50 MHz to 3.5 GHz and great for digital and analog RF signals. Use in 3-axis (isotropic) measurement mode or check each of the X, Y, Z axes! Includes audio alarm with adjustable threshold and 200 point manual memory function. Extremely sensitive: 38 mV/m to 11 V/m (equivalent to .38 nanoWatt/cm² to 30 microWatt/cm²). 4-digit LCD display offers mV/m, A/m, W/cm², or W/m². Display resolution: 0.1mV/m, 0.1µA/m, 0.001µW/m², 0.001µW/cm². Updates 2.5 times per second. Choose to display instantaneous value, maximum value, or average. ±2.4dB accuracy or better. Great for cell tower and wi-fi measurements. Uses 9V battery. 1 yr factory warranty. Model TM-195
"The 3-axis meter has given us information we could not possibly have guessed at, and has helped us make some initial changes which have helped me enormously. I was feeling as if I had the flu all the time with muscle aches and pains, an irregular heart beat and debilitating lack of energy. I started to feel better within days of making the initial changes."
Need to measure the new 5.8 GHz phones, baby monitors, DECT phones, wireless routers, surveillance bugs or other frequencies up to 8 GHz?
This breakthrough in higher frequency RF measurement covers 10 MHz to 8 GHz and great for digital and analog RF signals. 3-axis (isotropic) measurement. Includes audio alarm with adjustable threshold and 99 point manual memory function. Extremely sensitive: 20 mV/m to 108 V/m (equivalent to 0.1 nanoWatt/cm² to 3 milliWatt/cm²). 4-digit LCD display offers V/m, A/m, W/m², or µW/cm². Choose to display instantaneous value, maximum value, or average. ±1dB accuracy or better. Uses 9V battery. 1 year factory warranty. Model TES-593.
Similar to the Basic RF Meter above but with wider frequency range and SOUND! Very sensitive (down to 25mV/m = 1.6 µW/m² = 0.16 nW/cm²) and goes as high as 14.8 V/m (= 580 mW/m² = 58 µW/cm²). Broad frequency range too: 700 MHz to 6 GHz digital or analog signals with whip antenna supplied. ±3.5dBm accuracy. Includes sound feature.
Includes removable stubby antenna (which gives a very nice 360° view), with SMA connection. Requires one 9V battery. CE. Model ED85EXS.
6 GHz Basic RF Meter (Cat. #A436s) .......... $179.95
Can be used with 8 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 800 MHz to 2.4 GHz. 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). SMA male connector, 50 Ohm impedence. Only 8 cm long. Meter not included.
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). SMA connector, 50 Ohm impedence. Meter not included.
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.
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. 2 year mfr warranty. Detailed instructions included.
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.
Pulsing signal may be heard through the internal speaker
Power source: 2x AA Alkaline or Rechargeable (1.2 - 1.5V)
Power draw: 105 mA at 3 V
Battery life: 20 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 (Cat. #A139) ..................... Was $469.95, On sale now, only: $399.95
What our customers tell us:
"Very good quality! My husband ordered this along with an EMF Meter and a standard electromagnetic meter to check the levels in our home. We were very surprised about the results! Glad we purchased...now our neighbors and friends want him to check out their homes!"
The very unique ESI 24 checks for all 3 types of EMF: magnetic fields, electric fields, and radiowaves/microwaves simultaneously. Easy to interpret RED / YELLOW / GREEN LED lights indicate EMF level and are supported by a loudspeaker that gives an audible indication of field strengths. Sound frequency/intensity changes with increasing field strengths. Sound can be turned off if you prefer. Allows for quick and easy localization of the sources of different types of EMF. The display shows 5 different levels, ranging from extremely low (i.e. no significant radiation exposure) to too strong for prolonged exposure and distinguishes how much for each radiation type. Super easy and super sensitive.
16Hz – 3kHz
16Hz – 3kHz
50MHz – 8GHz
Includes Enhanced RF Mode in which only RF is measured using all 15 LEDs. Gives greater range and greater resolution. Sources detected by ESI 24: cell phone towers, cordless phones, wireless LAN, Wi-Fi systems, power lines, electrical installations and appliances, baby monitors and alarms, microwave ovens, cell phones, etc.
Magnetic field (nT)
Electric Field (V/m)
2 – 3900 depending on frequency
RF Enhanced Mode (µW/m²)
.06 – 5900 depending on frequency
Operates for about 10 hours on one 9V battery (included). 2 year warranty.
ESI 24 EMF Monitor (Cat. #A498) .................................. $280.00
This 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
ELECTROMAGNETIC FIELD MEASUREMENT IN THE NEAR FIELD
by Hubert Trzaska
In this book, internationally respected EMF measurement expert Hubert Trzaska discusses the specific problems of EMF measurements in the often confusing near field and the main factors limiting measurement accuracy. Book describes methods that provide accurate data to aid the development of new, improved standards. Measuring methods are examined for electric fields and magnetic fields; measurement discussions include power density and photonic EMF measurements. 232 pages, 2001
EMF Measurement in the Near Field (Cat. #A538) ….............. $89.00
Want to know the frequency of RF sources? Here’s a handy unit that’s priced right. The Broadcast Frequency Counter is an excellent economical choice for 2 big reasons: it offers both a frequency counter and bargraph type field strength meter. 7 digit display gives plenty of information about the predominant incoming frequency and the very low (<5 mV) nominal input sensitivity provides stable readings even with smaller injected signals. Covers the entire frequency range of 30 MHz - 2.8 GHz for digital, on/off keying, and analog signals. Telescoping antenna included, but this 50 ohm input unit can also be attached to other antennas or line with BNC connector (maximum input is 15 dBm). Powered by 9 VDC wall plug adapter/charger (included) or 5-hour built-in NiCd battery. 1 yr mfr wty.
Note: The sensitivity for broadcast signals is low. In other words, the broadcast signal must be quite strong to register on the bargraph.
Broadcast Frequency Counter (Cat. #A119D) ............. $269.00
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: 15-2700 MHz and 4850-6100MHz (1kHz resolution), and with excellent dynamic range. 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 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 cover efficiently some of the frequencies supported.
"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."
Completely Unique! Hear the VLF Signals in your Vicinity!
VLF signals (kHz range) occur naturally and can be produced by lightning, solar flares, and aurora. They can also be man-made, emitting from smart meters, solar power inverters, dimmer switches, motors, and fluorescent lights.
Use this portable VLF band radio to listen to the natural sounds of the earth. Lightning, whistlers, tweaks and auroral chorus can be heard from more than 3200km on the built in speaker or by using the included ear buds. Sounds can be recorded directly to a computer for analysis or future playback. Perfect for creative listening, storm chasers, researchers and paranormal investigators. It’s like a buzz stick for dirty electricity as well.
A high quality audio chip set gives the best sound experience possible. The revolutionary loop antenna allows the unit to be truly portable for field work, or for instant listening pleasure in the home. Separate controls for receiver power and audio volume allow for optimal adjustment to any application. An audio output jack allows for the use of headphones, connection to a computer audio line-in or sophisticated recording devices such as oscilloscopes and data acquisition systems. For long term recording, an external power adapter connection is provided.
Covers more than 600 Hz to 35 kHz, very intuitive and extremely simple to use. Great for demonstrating the benefits of dirty electricity filters. There is nothing else like it!
VLF Receiver (Cat. #A410) ……………. $199.95
This video lets you see and hear audio examples from a normal home environment