Hi all - new here - with a question that's been bugging me for a long time - I'd like to build some (maybe from existing kit) that would test for earth continuity - but I want it to be hand help - and no second probe - I.e. If I had a room with 100 computers all plugged in - I'd like a probe/pen that I could very quickly walk around and just touch on a bare metal part , and then some indication that it has an earth - maybe by plugging something in to a spare docket as a transmitter - I have tried a telephone tone generator - it doesn't work for some reason through an earth ring main - hope everybody understands what I'm after
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