WTBorrow: Metal Detector

I have a couple old reclaimed boards I have to make sure are free of nails or fragments before I can plane them. Can anyone help me out?

use a magnet?

its too thick… 1.5"

a really strong magnet?

you dont have an xray machine?

AHHH CRAP… this reminds me, i lost a power washer nozzle in the grass last week… I think i heard a lawnmower this morning… Hmmm…

Yes, i need one of these metal detector borrowing services also…

I have an old school one I dont know if it still works or not… Ill look into it