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[–] 1 pt

I thought those were for ghost hunting

[–] 3 pts

An EMF Reader measures electromagnetic frequencies. You can use them on anything that has electricity. Plants, animals, humans, and the earth emit frequencies in low ranges.

[–] 1 pt

I've used somewhat specialized versions when I repaired appliances, they were used for checking the leakage on a microwave oven, around the door.

Modern ones are a lot more responsive to more bands.