Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
The DFX will generally go as deep as the coil is wide. However, a lot depends on soil conditions, variances in coil manufacture, etc. Not all detectors of the same brand, or model are created equal.