I don't know of any but check some of the German/Turk websites. The Contraption project I've been working on can get a fairly pinpoint without having to walk over the target. remember very deep targets do not pinpiont all that well. Dig down a ways and re-check the pinpoint. Just so you know, I haven't used any of those just suggesting you search there. Beware the price for those feint of heart. remember detectors with lots of bells and whistles I call them sucker bait--some the case costs than the electronics inside.
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