A free program for Android, by My Mobile Tools Dev.
This application is designed to detect the presence of metals nearby. It uses your phone's built-in magnetic sensor to perform the measurements. The sensor is used to detect the magnetic field level in nature, which is about 30 to 60 µT. When any metal (steel, iron) is near, the magnetic field level will increase.
Make sure you are not around your computer or TV or Other electronic devices which can interfere with the readings of the magnetic sensor.
This app can be used for finding metal inclusions hidden within objects, or metal objects buried underground.
The calibration steps are as follows:
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