Metal Detector

This clever Metal Detector app uses your phone’s magnetic sensor to detect whether there’s any metal in the vicinity. It obviously won’t work with any non-magnetic material, but in our tests it really did register metal, even relatively small pieces such as you’d find in a door chain, incredibly well. The meter would shoot up from a default ambient 49u to 200+u. We couldn’t get it to register with metal wires embedded in our walls, but that’s maybe because the magnetic disturbance is too small. Quite an amazing tool though, even so.