i started out only digging tight 56-57 readings, and still ending up with alot of square tabs. A nickel every now and then. When I get a bit farther away from the heavy trash areas, I started digging bouncy numbers, from 55-59 or so, and am coming up with dirty grungy nickels often times. I hit a 80 TID , and figured it was a cent. I dig up a nickel, then another nickel, then a quarter below the 2 nickels. I should really try the one tone setting, but my hearing isn't the greatest anymore.I was pretty good using the one tone garretts back in the 1980's. The O-8 is a fun machine to use. Its easy to pick out coins near trash, due to the fast response, reset time. Love the lite weight, can swing it all day, but now the digging wears me out.!