Buried metal
I can't point to anything specific, but I have seen construction workers using assorted sensors to detect buried pipes, so I know there must be something off-the-shelf out there.
Space/Science » in reply to re: How do you put a computer to use?
I can't point to anything specific, but I have seen construction workers using assorted sensors to detect buried pipes, so I know there must be something off-the-shelf out there.