I was in the Coins mode because it was trashy. Worked great on a lot of coins and was fun learning something new about my Ace. Wish I had a list of Ace tricks. Found it failed the test on a dime that was on edge at 3" and a zincer. Had to trust the repeatability of the Ace to get these coins. What was interesting is that some of the trash ID'ed correctly after using it. Sort of like a backwards "twitching"
The big trash targets would go from "dime" reading to the bottom of the scale.The nickels failed the test. I know from experimenting in the 80's with something similar (bobbing the coil straight up and down over the target) that you can get better results in a lower discrimination setting. My next experiment will be in Jewelry mode. It worked on a dime at 4" and the quarters went beserk.
