I did a test using a mineralized granite Cobble the stone is about 9 inches long and 4.5"x4.5" i ground balanced on it and it GB at 87. no detector yet has got thru this one in disc very well i put a nickel under it and using the small OOr coil in two tone sense 75 i got the high tone both ways, my other two tone machine would only low tone . I found myself saying. this machine is different. I tried the three tone at 85gain and had to slow the sweep and only got it one way so the two tone has an edge in the minerals
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