Went to a park and it has been hunted a lot. Using park 2 and 5 frequency got 3.42 in class. It makes the 600 quiet. A lot easier to hunt with. Find nickels a lot easier. But if you have a I d no. In 34 or higher and makes a gurgling sound its iron. No. 21 is caps. But but easier to get clad. I found some coins up to 8 in.. and the ground here is dry and it is clay. Just testing it out.