What I have in mind is underwater detecting in Very clear to Pretty clear water Via hookah system for rings, pendants, coins...I'm not new to detecting...I've been keying in on the Excal because of minelabs rep. & the tone I.D....I'm pretty well set on the Idea of haveing some sort of I.D. so that I'll have at LEAST an Idea of whether I'm looking for something shiney or dull or rusted...The unit will also need to be capable of dealing with hot rocks...I know this is not the most active forum but need feedback from you divers out there....Thanks TT