Open Source Theremin is able produce sounds based on the magnetic field around your phone. You might manipulate it using a metal object such as a coin or your ear phones.
It might serve as well as a metal detector!
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v.0.1.6: bug fix, +performance
Tags: theremin , open source theremin's , gpl metal scanner , theramin , gpl , theremin application , theremin gpl direct , theremin gpl how to play , theramin apk