So I've got a rigid scout and with a line illuminator and a 512mhz sonde for tracking pipe. I've got a nice Garrett metal detector, I've got a deep penetrating pulse induction metal detector. All that to say I've got a lot of money in devices to see what's underground before I dig. I've seen the city guys use these a couple times when nothing else could locate a pipe and I thought they were fucking with me...
Anyway I made some and it creeps me out but these things work 100%. Disbelieve all you want but you're wrong, just try it
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