I segment the depth meter into quarters in my thinking, but anything over the halfway mark I am definitely going to dig especially questionable ones. I happen to like the explorer depth meter as most other brands require that one has to switch to all-metal to get depth reading. It helps to keep sweeping after you get a signal to find centering over target. As for screwcaps, they generally hit more to left on the screen than coins, they give off a very strong response, but I dig a lot of screwcaps, just to find out for sure,
Steve(MS)
Steve(MS)