I have had coins buried in my test garden now for three weeks. Ranging from 6 to 12 ", and from IHP's, V nickels, Rosey dimes, Silver quarters, Lg cents, and Kennady half's. So far the deepest coin I can hit with the D2 is 10" half. and 8"'s for quarter. I hope the D2 does better on deep coins than that. My AT Max hit all the coins in all metal mode.