It was a perfect job for a metal detector, but since they didn’t own one, a serviceable unit had to be assembled from literal garbage. To start with, [zaphod] had to research how a metal ...

Metal detecting is a fun pastime, even when all you can find is a little bit of peace and a whole lot of pop tabs. [Huygens Optics] has a VLF-based metal detector that offers much more feedback ...