MetalDetector is a free app to help you find magnetic field! You can use it to look for any metal objects.

How it works:
MetalDetector uses the mobile phone's built-in magnetometer sensor to detect the magnetic field strength! Once up to a certain value, the alarm rings. Iron, steel, cobalt, nickel, etc with magnetic metal can be detected.

Note that the distance and magnetic size affect detection results, please close to the measurement.

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