Why does my detector find large deep nails and rusty iron even when set to reject pull-tabs?
Unfortunately, most motion detectors can be fooled by large rusty items, This is especially true of circular targets, such as iron washers and steel bottle caps. Sweeping the detector faster will help a lot on the steel bottle caps, and it will help some on the washers. Fortunately, large pieces of iron will be heard as much ‘broader sounding’ targets than non ferrous items in the all metal mode. Experienced motion detector users rarely dig large pieces of iron.
