I bought one of the more expensive brands of metals detectors last year. I think I paid around $900. (Yes there are some that are a lot more) Back when we were kids my dad had one and I remember digging up a lot of pop tops and bottle tops so I wanted one that could tell what was junk and what wasn't. Well I've only used the new one a couple of times and guess what I figured out? Even if the metal detector says it's junk, I still dig it up. I'm just too curious to know something metal is down there and not dig it up. The metal detector may say it's tin foil, but how do you know it's not tin foil wrapped around a stack of hundred dollar bills? I could have probably saved some money if I had though of that in advance.