I'm not looking for ghosts on these counters so I can't comment on that aspect. In terms of electrical applications, the meter has a very wide frequency range, more than just a few years ago. The device only detects magnetic fields, no electric fields, radio frequencies, etc. If you want to test the device, place it near a running motor whose frequency is within the range of the device. The device has found all fields that I want to monitor. I've compared it to some of the best EMF meters I have and it worked within recommended parameters.
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