I've always wanted a metal detector. Not so much for treasure hunting but for utility purposes like maybe tracing a buried wire, tracing a conduit in a wall, finding the bolt I just dropped in the lawn, that sort of thing. I know more about ground penetrating radar than I do about consumer metal detectors. On ground penetrating radar I know that, for my purposes, I can't afford it. Metal detectors, to my knowledge, were first used in WWII. From an appearance standpoint I don't see much difference from current consumer model. Has there been any evolution? I find metal detectors that sell from between $50 and $300. Is there much of a difference? Do lots of LED's or analog meters serve much purpose? Can they really detect different types of metals? What is the state of the art of metal detectors? What do they do well, and not so well? What is their detection range in dirt? Can you make any recommendations on a good model? Does one stand above all others today? Thanks for your help.