Seems to work but I don't know how reliable the numbers are. They're jumping all over the place and you have to point the device at the electronics or the object being measured from several different angles before you can sometimes get a reading. So it's definitely not high tech, but it's fun to play around with and see what kind of things can block EMF. I tested shungite vs sock lol. Both really work! I have a Ghost Tour event I'm going to and I think I'll take it to see if he finds anything there as I've read reviews of people using these devices to find evidence of ghosts to collect :-)
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