That's puzzling. PC board rev seemingly dated 2010, but the construction looks 1970's.
I've seen many metal detector PC boards in several different technologies, but looking at that photo it would never occur to me that it's a metal detector. It just plain looks wrong.
If it's a metal detector, you might have better luck over on the Geotech forums. This is the LRL forum, which isn't about metal detectors, it's about dowsing rods with fraudulent electronic stuff added.
--Dave J.
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