This looks like a PI metal detector
I think you guys are not looking at the video. The man has the detector above the "cave" setting on the ground and it is connected to what looks like a 1 square meter coil. He is putting various metal objects under the coil at what looks like about 2 meters distance. when the metal object (e.g. the 5 gallon metal gas can) the detector above the him detects the gas can. It looks to me like the detector is very likely a pulse induction (PI) type metal detector hooked to the big 1 meter coil. So it is not a dowsing LRL. I may be wrong but that is what I am seeing in the video - a standard PI metal detector. It has a nice glitzy display to show signal received level but the rest looks pretty standard PI
There may be a little sales "fraud" going on as the first object the man takes into the cave looks like a coil wound on some PVC pipe. My bet is the small handheld coil is resonant to the big PI coil frequency and will increase the ability of the PI detector to detect the small metal coil the man is holding.
Goldfinder
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