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
There are few detectors that I haven't used and this is one of them. The price for this PI new is about the same as the Excal II, but while the PI will find all metals if you are diving this is what you want. For finding wrecks or relics buried in the coral a PI is what you'll want. I've taken the Excal down to 140 ft. with out leaking but have no idea of the Aquascan's water proofness.