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ESI-24 Combination Meter

ESI 24

Combination meter with great RF sensitivity

$280.00  :  add to cart



Sophisticated and Simple

$399.95  :  SOLD OUT - Coming Soon - AM-11 enhanced Acoustimer

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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ESI 24 EMF Monitor

ESI 24 EMF Monitor
Shows All 3 EMF Types at Once

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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) ........ $347.00 add to cart

HF35c with Customized Foam Lined Hard Case HF35c with Hard Case

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 very weak signals, in Near Field and Far Field Emissions. 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 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) ........... $795.00 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) ............................ $199.95 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) ................ $169.95 add to cart

Video showing how to use this meter

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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)
- 6 GHz Basic RF meter
- RF Explorer
- High Frequency Meter
- PC Based Oscilloscope (up to 40 MHz)

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

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ACOUSTIMETER - Out of Stock. This meter (model AM-10) is currently getting some upgrades.
The newer model (AM-11) will have all the same features with a wider frequency range.

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. 2 year mfr warranty. Detailed instructions included.

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 ±3 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: 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) ..................... $399.95 SOLD OUT - Coming Soon - AM-11 enhanced Acoustimer

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 our neighbors and friends want him to check out their homes!"

Online customer, Austin, TX

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Detects & Displays All 3 EMF Types at Once

The very unique ESI 24 RF Meter checks for all 3 types of EMF Radiation: 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.

Frequency RangeAxis
Magnetic field:16Hz - 3kHz3
Electric Field:16Hz - 3kHz1
Radiowaves:50MHz - 8GHz3
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)<2080-120160-200300-400>1000
Electric Field (V/m)<615-2025-3035-40>50
Radiowaves (µW/m²)
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 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

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

Continued on next page...

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

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