Though it technically doesn't have a tone ID, The Lobo ST does have variations in tone on different targets, both in the length of the signal and it's pitch. For me Aluminum pull tabs have a higher pitch than US coins, perhaps with the exception of the newest nickels. The length of signal is also more clipped or shortened at the ends of the signal on aluminum as well. Burnt aluminum shards, or cans pieces at the beach, are even higher pitched, and screw caps and bottle tops are very highly pitched. Coins are lower, more mellow, and of a longer duration on the double beep. Foils, tend to be crackly and chopped, with no double beep. Any large object will of course, try to override the discrimination circuit, and sound loud and clear, so I try to determine the length or width of it before digging, by running the coil over the target up and down, and crosswise to see the size of the area it takes up. I generally set my disc at around 3 and a half, or just knocking out light foils, and dig everything. All-metal of course for nuggets. Hope this helps, Dave Davey