My friend got permission to hunt an old church not far from my home town. We have hunted out there so much that if a place can be hunted out then this place probably is. One day he decided to set up a little testing garden for our detectors so he buried a 6 inch Indian Head, a 9 inch silver dime, and a 12-13 inch silver quarter. I have used this to test a few different detectors that I have purchased with mixed results. I decided after work that I would take the CZ5 out there and running it over the 3 coins. Once I found the area where the coins were buried, I got in my opinion really good results. I started with the Indian Head and I was very confident that the CZ5 would have no problem. The CZ5 did not let me down as it nailed the IH with a correct ID. I moved over to the dime and the CZ5 nailed the dime also with a correct ID. I thought that it would be nice to push the limits and I was able to get a solid two way signal an inch or 1 1/2 inches over the top of the target again with a correct ID. This is all with the 8 inch coil so to me that was IMPRESSIVE !! Here comes the weird part. I moved over to the 12 inch quarter and I got one high tone but usually an occasional iron grunt. I wasn't disappointed but could not understand why I could solidly hit the dime at 10 inches + but the 12 inch quarter would not give a good response. The only thing that I could figure out is that the quarter could have moved and be on edge and thus putting it out of the range of the 8 inch coil. I really want a 10 1/2 inch coil and I really believe the larger coil would nail the quarter without a problem. The bright side of the test is that I have in the past tested my Etrac and my XP Deus on the same coins and neither machine would give as good of a signal on the dime as the CZ5 did and even with the Etrac the quarter was not a good signal with the Pro Coil thats a lot bigger than the little 8 inch on the CZ. The Deus gave a real iffy signal on the dime and if I remember right an iffy signal at best on the quarter and I'm not sure that I got a signal at all. It was a while ago.