Scanning parks and beaches with one of these can be a unique and fascinating hobby.

If you think of a metal detector, you’re probably thinking of a fairly simple device with a big coil and a piercing whine coming from a tinny speaker. [mircemk] has built a more modern adaptation.

If you purchase an independently reviewed product or service through a link on our website, Rolling Stone may receive an affiliate commission. Metal detectors used to be really bulky, heavy machines, ...