Not many targets in the Gulf near me, really are sanded in pretty good but one target I had gave me two tones, must have been its orientation to the coil. This ring is 14k yellow gold with a white gold square holding 5 diamonds. Interestingly, when you air test the ring and present the square face to the coil, you get a high tone (like silver) yet when you go across the width of the ring, you get mostly a midtone. When I first heard the target, I got two tones and totally expected to find another piece of canslaw... it was a nice surprise. Air tests go from a 12-22 though a 12-37 dependant on distance and ring orientation to the coil...
Cliff
Cliff