I just got a used Garrett Sea Hunter Mark 2; it arrived in the mail yesterday. I did a quick test at a local beach and found some aluminum can scrap, verified it worked. Later at home, i checked out the driveway and found a bunch of nails, pennies, and other assorted junk. Lots of iron in the rocks here, will be great when i set up a smelter. I might hit the beach this morning for a while....