i remember seeing this device in an advertisement. Maybe it was Bob Fitzgerald at Treasurenow (they have a website) or it could have been somebody in eastern USA think the name was Snyder. Looks for everything like an MFD (molecular frequency discriminator). What that means is you turn on the unit and let it sit for five minutes then with L-rods circle it from about 5 meters and watch for the rods to cross. GS means gold or silver. You could look in old treasure magazines around mid 1990's. Maybe a clearer photo would help me to see what the controls are.
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