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I have one of these, just curious if anyone else heard of them? It was pretty darn deep for it's day, IMHO, still is. The one I have is a prototype I purchased from Kellyco back in the late 80's early 90's timeframe.
Here are some pics:
http://gjy.us/ad-14/
They also made a lesser version called the AD-11.
I was told the coil type was compatible with a fisher line of that era, but I can't recall which. It had two discrimination circuits, you toggled between them from a tactile dome switch mounted on the grip, and there was another tactile dome switch on the grip for all-metal no-motion mode for pinpointing.
Here are some pics:
http://gjy.us/ad-14/
They also made a lesser version called the AD-11.
I was told the coil type was compatible with a fisher line of that era, but I can't recall which. It had two discrimination circuits, you toggled between them from a tactile dome switch mounted on the grip, and there was another tactile dome switch on the grip for all-metal no-motion mode for pinpointing.