I'm starting to like my Tejon as a coinshooter because of the dual disc and setting the second disc above foil doesn't lose as much depth as I originally thought. For example, I can get a dime sized target at 8", in moderate ground, and it sounds off as a good target on the first disc set to eliminate small nails and when I flip over to the second discriminator, set just a hair above foil, it still beeps as a good target. I just recently figured this out when I set my GB slightly negative over the moderate/slightly hot ground we have around our house.