How to detect metals with your Android phone
Turning your Android into a metal detector is very simple, you will only need an application and your cell phone must have a magnetic sensor, practically all current smartphones have such a sensor.
To find out if your device has this sensor, simply download the application CPU-Z
CPU-Z
Having seen that your device has the sensor, simply download the Metal Sniffer, and then just bring it close to any metal and the graphics on the screen will indicate if there is metal near your cell phone.
Metal Sniffer
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