Every mobile since has a built in magnetometer. This magnetometer can be used to measure interference in electrodes caused by metal and other magnetic stuff. Best Metal Detector uses your devices magnetic sensor to measure magnetic field values and turns any Android into a real metal detector. It also works on electric wires and power sources.
It's free of charge to get the installer of Best Metal Detector, also, you can have a look at users' reviews on Droid Informer. The app runs on Android 4.0 and higher. This download is completely safe. This application has been originally designed by Superozity and it is related to the Tools category.