A nugget hubnting book I read says to do this with a gold nugget. I don't know if anyone needs this for ring hunting, but I use a man's 10k ring (hits on ground level at 53) and I toss it in my yard then search for it. It's not so much to find it as it is to hear the sound it makes without seeing it and knowing exactly where it is. I want that mental alarm to go off in my head--"Hey! That's a ring!!!". The reason this works well in my yard is the metalic junk level is very near what you find in a city park. Even worse LOL. Of course the10k ring hits very loud but on edge it gives a nice double hit. Even when it is laying flat it also gives a little extra blip. I have tried to discover a difference in the tones between a ring and a pull tab, but I gave up. I still can hear some before and after sounds with the aluminum, but the double beep of the ring is very distinct (and quick) and the AT really is on the mark with the extremely fast recovery speed. What bothers me now is I know I have heard that a few times and did not check it out.