When I first started collecting free wood from along the street, it occurred to me to protect my power tools by making sure as possible that all the nails were out of the boards. If memory serves, Norm Abram placed this idea in my head. I bought a down and dirty wand style metal detector to check out the wood as I clean it up. The one pictured cost less than $20, maybe about $10 really. I’m not sure. I bought it several years ago from that auction website. I will say it’s not flawless. Small staples escape its detection capability. There’s no substitute for an additional look-see with they eyes.
-- Ni faru ion el ligno!