... GAUSS technology that is both an audio and visual detector. This metal detector was first used in the field in 1984 and ... Functions:(1) Most common frequencies are Copper, Silver, Gold, P.T, Tin, Jewel, Aluminum(2) Detecting Range: 1000m(3) Detecting Depth ... LED’s (channel indicator lights for Copper, Silver, Gold, P.T, Tin, Jewel, Aluminum) across the top; each is labeled for ...