Just got back from a saltwater beach. This beach has been hunted all winter by many pros. Two nickles, one clad penny and one mercury dime. The dime was over 8 inches down in damp sand. The CM Pro gave a solid wheat penny signal. When I throw the silver dime on the sand it still reads copper penny. So I guess I can conclude silver dime show up under copper penny sign. The CM Pro seemed to get a little jumpy in the saltwater; but it can hunt wet sand no troubles. Today I just ran iron discrimination; otherwise it beeps all the time. Lots of junk and snow fence wire. When it says foil it has been foil. When it says tabs it has been tabs; but at the same time gold rings are in these zoners. So for now I am digging. It is not a good machine; but a great machine. For $245.00 at my local dealer a good investment. I had so much fun and the tide was not right so I left the Surfmaster Dual Field in the car. The lower water was nothing; but gravel. So I am hunting tomorrow morning's low tide for gold with DF. Oh I saw one dead sandflea, no more digging for him.