Dirty Electricity Line EMI Monitor

This Dirty Electricity Monitor Line EMI measures electromagnetic interference in a single-phase AC power line.

No battery needed as it plugs into a wall socket. 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 half of the maximum sensitivity). A speaker plays the sound of the EMI, with amplitude demodulated, in order to identify EMI sources such as AM or shortwave radio frequency.