You're right they deleted it. Can't find it either on youtube anymore. Looked pretty interesting.
For those who didn't saw the video:
They showed a metal detector being held with the coil in the air (couldn't remember the brand but it had a display). He said something about setting sensitivity and doing ground balance in the air. After doing this you could use the metal detector like a PDK to locate things from a distance. One can also use the iron discrimination from the detector. But for pinpointing the metal detector has to be set to standard settings again and do ground balance normal on ground.
I don't know if that makes sense but I have to try it for myself.
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