I have 2 other EMI detectors that are useless. This one was good right out of the box. I think a few reviewers complained about the lack of instructions. You don't need instructions, it's so easy to use that you don't need an engineering degree. I'll throw away my 2 detectors which pick up next to nothing. The diagram on the right of this tool measures energy fields (magnetic) and "alternating magnetic field" - or in other words. Current that pulses too fast and is bad for your health. This cute tool has picked up the destructive electric field of our SMART METER. The next project is to block smart meters.
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