Want a quick and easy EMF reader? All you need is an amplifier and a microphone. The mic will pick up the electromagnetic noise from around you and the amplifier will turn it into something audible.
Obviously this isn't a precise way of measuring, but if you're lacking a gauss meter, or just want to cheaply investigate the EMF in your home, this is a fun solution.

Step 1: Putting it Together

I used a suction cup telephone mic [generally used to record telephone calls] and a battery powered  mini amp I picked up from Radio Shack.

Plug the mic into the input jack of the amp.
Hmmmm good idea. Have to try it.
Hmm... I don't see how this picks up EMF :S Normally, EMF induces voltage within a coil, I suppose if its a dynamic mic? Cool thinking though :)
The sensor (in the suction cup unit) attached to the audio-amplifier is a small coil.
does the amp need a power source?
Nope, the one in the demo is battery powered.
Another readily available thing you can use > Just use a portable hand held radio or walk-man on AM tuned between stations or to a station. It will detect ANY Electromagnetic Anomaly>>>>
Just tried this out with my hand-crank emergency radio. Definitely picked up some interference when the antennae is pointed at an EMF source, but the mic makes it much clearer. When rested against the PC you can hear modulation from the HDD- with the radio, it was much more subtle.
we used to use those in the phone company, use a coil on the end of the cable and a signal generator to find metal on metal contact that shouldn't be there. Very good and simple.

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