New tone version at area where houses torn out for freeway build. 7 wheaties so far, no silvers. Houses were built from 1945-1955 approx. I crank threshold FCW, Sens FCW, Notch Off,Disc Mode. Set Notch width at midpoint, disc level at arrow. When I get hi tone first rotate NW to both limits to see if tone breaks if so it's likely trash. Return NW to center. Then lower Disc to Min and see how much iron is nearby, then rotate disc slowly CW to see where target tone quits. Use this method for all three tones above iron. Have found in disc mode that the threshold setting affects the duration of the target tone and depth of target. Using thumb this method only takes seconds. Also pump coil over target to see if tone changes, disappears , or breaks up, or remains steady. Use this with all target tone above iron. This detector is a classic!