I am currently evaluating it as a scuba tool. It is compact, fits neatly in my old titanium scissors pouch - scissors rusted. So far no indication of rust in either salt or fresh water. Former NAUI scuba instructor -
Bought three more when on sale. I searched for cutter for emergency like getting hooked. None better that I found or tested. Cuts standard reaction based hooks easily. Must have for anyone who enjoys fishing.