Ok 1st i have my MD on all metal conductive mode. now is it possible to get a, say -5 have a low tone and then get a -5 with a high tone? what im asking is can u get different tones with the same number or are all the tones assigned for that particular number? 2nd are there any coins in the 20-29 range or are they all just 30-39 and 14 for nickels, because if its that way im blocking everything except those numbers.thanx