Best Android app Metal detector: https://play.google.com/store/apps/details?id=info.monapps.main Your smartphone or tablet is real metal detector with this application professional. This tool allows the detection of metal using the magnetic sensor built into the phone. In addition to the digital display of the detected magnetic fields. Usage is simple: Open the application on your device, and move, values of the magnetic field are constantly fluctuate. Your device must have magnetic sensor ! If this app does not work properly, it may mean that your phone’s sensors are damaged, broken or non-existent.