I have done quite a bit of metal detecting, but when I UE I try to take minimal kit with me, so the metal detector usually stays behind. I have found old keys, silver rings, pewter lighters, all kinds of pewter crap, and of course coins while metal detecting around old areas.
My tool is just a ordinary one like this one here
http://www.detectorall.com/categories/Walk-Through-Metal-Detectors/