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Dirty Electricity Line EMI Monitor

Dirty Electricity Line EMI Monitor


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  • Dirty Electricity Monitor

    The Line EMI Meter measures electromagnetic interference in a single-phase AC power line

  • No Battery Needed

    Plugs into a wall outlet

  • Electric Mode

    covers 40 Hz – 100 kHz with a range of 1 – 1000 volts per meter (V/m)

  • UK Plug

    Comes complete with a UK plug

  • Test Your Dirty Electricity Filters

    Try the monitor with and without your filters to see what difference they really make!

  • Easy to use

    Simply plug the meter into electrical outlets to find out how much dirty electricity is present on nearby wiring.


What is a recommended EMI level?

Ideally, dirty electricity (EMI) levels should be below 25 millivolts (mV). Levels between 25 and 50 mV are marginal and should be reduced if possible. Levels above 50 mV are undesirable and steps should be taken to lower them.

What voltage does this work with?

The TriField Dirty Electricity EMI Meter can be used to measure dirty electricity on 50/60Hz AC circuits with a voltage anywhere between 100V and 240V.

Will this work in my country?

The meter is compatible with 50/60Hz AC electrical circuits with a voltage anywhere between 100V and 240V. This means it can be used in many countries around the world with the correct adapter. This will ship with a UK adapter.

What are the dimensions of the device?

5.2 x 3.6 x 1.6 inches; 132 x 91 x 41 mm

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We have a PDF instruction guide for the TriField monitor which you can download from the button below.

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Dirty Electricity Line EMI Monitor


The Line EMI Meter measures electromagnetic interference in a single-phase AC power line. It plugs into a wall outlet (mains socket) and requires no battery. It immediately displays total line noise in millivolts (range 1999 mV, resolution 1 mV) in the frequency range 10 KHz – 10 MHz (the frequency limits at which sensitivity is ½ of the maximum sensitivity). A speaker plays the sound of the EMI, amplitude demodulated, in order to identify the EMI source (such as an AM or shortwave radio station vs. a motor vs. an electric arc).

Additional information


Dirty Electricity


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