In Ferrous Coin mode, a silver dollar registers about 12-44 TID, and shows up on the screen, yet if you have the area above it discriminated, it won't give an audible alert. If you open up the 1-42 or so range, and discriminate the 12-44 range, it will give an audio indication, But, won't give a TID#. Seems they have some of the code goofed up in the ferrous coin mode, Keep an eye out if something is showing up on the screen, but not giving an audio alert.