Acoustimeter (AM10)
(17 customer reviews)


** OUTDATED MODEL. New Model AM11 is the replacement**


The Acoustimeter is our most versatile microwave detector. It presents RF measurements as an audio signal, with LEDs and accurate readings on an LCD screen. It also measures both the peak and average readings at the same time. It covers the spectrum from TETRA all the way up to and beyond the 5.6 GHz WiFi and WiMax frequencies, and is sensitive down to 0.02 V/m, making it a suitable instrument for those with severe electrosensitivity. The user manual can be found on the “Further Information” tab.

*This product (as all our meters do) has a 5 year return to base warranty*

Calibration notes

  • 0.4 kg

Out of stock


The Acoustimeter is our most versatile microwave detector. It presents RF measurements as an audio signal, with LEDs and accurate readings on an LCD screen. It also measures both the peak and average readings at the same time. It covers the spectrum from TETRA all the way up to and beyond the 5.6 GHz WiFi and WiMax frequencies, and is sensitive down to 0.02 V/m, making it a suitable instrument for those with severe electrosensitivity.

Further Information

The Acoustimeter has been designed to enable you to make a quick and informed judgement 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. Sound samples are available on this page to help you identify what kind of signal your Acoustimeter is measuring. 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.

In areas where there is virtually no modulated microwave radiation (below the level of 0.02 V/m that the Acoustimeter is designed to detect), it is possible, with the volume turned fully up, to hear faintly some background clicking. This is from internal workings of the Acoustimeter and is not related to any external signal, and is therefore of no concern.

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 fast LEDS displaying showing:
  • — Peak exposure levels in V/m
  • Average exposure levels in µW/m2
  • Measurement range: 200 – 8 000 MHz ±6 dB ±0.02 V/m
  • 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

Additional Information

Dimensions 19 × 10.2 × 3.3 cm

New model AM11 coming soon


Radiofrequency fields


Peak / Average readings


Volume control

What’s the difference between peak and average exposure?

Download Manual

The Acoustimeter reads differently from some meters as:

  1. It has a very fast response (up to over 8 GHz and reacts to very short pulses)
  2. Peak readings are what they say – the highest sampled reading – though the sampling and processing rate means that there are some gaps and it will not always react to a SINGLE VERY short pulse (less than about 5 microseconds duration) – though it will react correctly to much shorter pulses that are regularly transmitted (such as from WiFi). The peak-hold reading on the LCD screen can be higher for some types of signal than the highest LED seen flashing as the Peak LED display does not show all the pulses in order to make it easier to see. The LCD peak-hold is the highest measured since switch-on. It is cleared by switching the meter off and on again.
  3. The Average reading is a true mathematical time-averaged rolling average of the latest 6400 samples, updated 4 times each second. This gives the correct reading for DECT and WiFi and is much lower (DECT average power is about 0.01 of the DECT pulse power) than many other instruments which use the highest peak reading and then translate that into an equivalent average power. That is not correct as power is measured as total energy used/delivered per second and not the energy in a short pulse of say 10 milliseconds followed by a 990 ms gap. It is important that we understand this as most international standards are based on true average power (actually usually averaged over 6 minutes!).

N.B. The internal antenna is at the top rear of the case. Signals are best measured when the source is 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.

Example Sounds

17 reviews for Acoustimeter (AM10)

  1. Leonore

    Although i dont know how to interpret the actual numbers on the scale, this meter has warned me and friends about the green,, orange and red zones. the meter bolsters my arguments that I am radiated from neighbors’ router. Its a fine diagnostic tool I use often in my environs and in that of others.

  2. AK, London, UK

    Very cool piece of kit – I use this to measure mobile/wireless radiation and the PF5 to measure electrical fields and magnetic fields. You learn a lot as you go along measuring different things. Can draw your attention to problems you otherwise wouldn’t have noticed.

  3. CM, Scotland

    I am very impressed with the Acoustimeter.

    It is very sensitive. With a little bit of time and ear training you can quickly tell what kind of source is emitting the electromagnetic waves. For example, on a mobile phone bluetooth has a different sound from WiFi…

    I have tested it on cordless phones, microwave ovens, mobile phone towers, mobiles phones and various bluetooth devices, to name but a few.

    The meter itself is quite pricey but it is one of a kind and I couldn’t find anything like this anywhere else on the internet. My passion and interest in this area is what drove me to pay the large sum of money required to get my hands on one. It was posted to me via Royal Mail Special Delivery and came with a custom protective bag.

    It was very interesting for me to know what I was being exposed to on a daily basis and the Acoustimeter really lets you “see” that.

  4. Raymond Tricone, France

    Je suis très satisfait de cet achat.
    Son prix me faisait hésiter depuis longtemps, mais j’ai eu l’occasion d’utiliser un Acoustimeter prêté par une amie. C’est extraordinaire de pouvoir identifier par le son l’origine des émissions (WiFi, Buethooth, DECT, Téléphone Radars etc..)
    Je ne peux que conseiller cet investissement.
    De plus j’ai eu déjà l’occasion d’utiliser le service après vente d’EMFields pour un DEtekta qui était tombé en panne.
    Tout s’est très bien passé et on m’a remboursé mes frais de port du retour.

  5. RC, Kettering

    Excellent product for sensitivity and and range of RF bands. It can also be used to find direction of RF field. It is bit pricey though for what is basically an Ariel, hence only 4 stars…

  6. HBJ, Jerusalem

    Great product. Prompt delivery. Easy to use and very sensitive through a wide range of EMF. Well done.

  7. JD

    Rest assured that I have a very high opinion of the reliability and integrity of your products, the Acoustimeter’s sensitivity to low fields, and today coincidentally a customer remarked on its ease of use.

  8. *anon*

    Thanks for this good information. Our gang ADORES the Acoustimeter no matter what anyone says. It may not be a spectrum analyzer, but it tells us what we need to know and it duly impresses all who hear its messages.

    We are your diehard fans till death (from Wi-Fi) do us part.

  9. *anon*

    I most of the times use Acoustimeter at the beginning of a site survey, in exploratory mode, because I believe it is the most effective broadband meter device I own to get a first complete outline of existing RF signals, before attempting any narrowband analysis. I also found it to give consistent readings when compared to other measurement methods.

  10. Stefan

    Thank you for your promptness and professionalism.

  11. JB

    This device is a God send for me

  12. CZ

    Excellent product, very accurate and easy to use, excellent service from EMFields Solutions, thank you, Sarah, thank you, EMFields Solutions!

  13. BS

    I am delighted with this meter. It is easy to use and the LED displays and the sound make it easy to identify most sources of microwave RF signals. Very helpful for me.

  14. RHW

    I’m very satisfied with your service, which was fast and well organized. I’m also satisfied with my Acoustimeter. Thank you!

    Best wishes,
    Robert H. Westerlund
    (You can visit me on YouTube and/or my little homepage. 🙂

  15. PG

    I bought an RF meter recently. It has been absolutely invaluable. I take it everywhere. I have discovered some amazing information. Like coastal paths near St. Agnes Head Cornwall, beautiful and wild but with radiation reading of greater than 6.0 V/m. Shops and high streets can be in the range 1.0 to 5.0 V/m. I wouldn’t be without it now. I have mapped out very low emissions routes to walk in my neighbourhood.

  16. LD

    Ottimo venditore, ottimo prodotto, affidabile, consigliato!

  17. MM, Bucharest

    Very nice tools! Both the Acoustimeter and the ELF Meter are very sensitive, responding to even the smallest move or rotation.

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