I have a 7" clad dime that only has been buried for a week. Ultra was in field mode, sweep speed 1, sensitivity 28, ground balance 65.5 and hit the dime 96 97 vdi reading. Raised the coil 1" above still hit with same vdi. Raised the coil another inch lost vdi but still hitting. I'm speculating out in the field i'll be able to hit a 10" silver. I dropped the sensitivity down to 25 and still hit the 7" dime but not as pronounced. Tried in all the other modes and it hit the dime except for the beach mode, which doesn't bother me because I'm a land hunter. This is in Kansas dirt. It is to hot to get out so I will be doing more reading and testing. I'm thinking there might be some more tweaking i can do to squeak out a little more depth. I have 4 other detectors but the main reason I wanted to try the Ultra was the weight of the machine. I had back surgery a few years back and with the weight and depth I think I found a new love. I bought it from Bart at Big Boys Hobbies great guy and great to deal with.