Was out detectin' since the school's are out. Got out to the field area and decided to try a/m mode ONE more time. I was astounded to hunt nearly 5 minutes without a signal! Had to pass my screwdriver in front of the coil to make sure I wasn't dreaming. Well, to make a long story short-the iron nails, paper clips, etc have a multi-beep sort of like a coin on edge but with more beeps- sort of dit-dit-dit-dit. The washers will still sound off as well as batteries (AA). The kicker was that there were quite a few nickels there that had a funny coating on them that had been missed by others. But I bet I didn't receive over 10 signals that would have been picked up by the disc mode anyway. That's the other kicker-when in doubt it's so easy to just flip the disc switch on and the big iron will either sound or blip. Now I got to thinkin' (dangerous, I know_) that if school was out and I cleaned out the trashy signals, and next year some rings were lost, and since I'm finding more nickels, which are next to rings.......hmmm.