I've been following this forum since I bought my Pro back in May and I don't recall anyone advising searches of parking lots, especially loose gravelly lots. Last week I was at the beach and on my way back to the car, decided to scan the lot a bit. I must have pulle 20 pieces of clad (mostly pennies) in less than 10-12 minutes. The great part was that the probe found them quickly and I probably dug (literally picked up) more than half with my fingers. Now, it would be just as easy for someone to drop a ring as it would be a pennie.......
