Ground Balance in all metal mode... I run mine in Auto Re-tune, Discrimination set as low as you choose, with a medium speed easy sweep,... I run mine just below nickles, There are few places here that jewelry would be recovered, so that's as low as I run my Disc., and setting there eliminates a great deal of trash... Some suggest running your discrimination turned all the way down to zero, you' will have to decide that based on your hunt sites and what you are hunting for and how many pieces of trash you are willing to dig..., aside from that, you and crank the sensitivity until it begins to false or chatter, then dial it back a touch. I usually tune both threshold, and Sensitivity to somewhere around the 3-4 O'clock position, and I have found that of all the search coils the stock 8" brown do-nut, it's a very nice all around coil even when compared to aftermarket options, its hard to beat, but the Tesoro 5.75" concentric is what i use, ... if you were to ever consider an alternate coil, that 5.75" concentric would be the one. I have found the B2µMax runs good with the clean sweep coil also, ... You will definitely enjoy that machine, It's really is one of my favorites.