The app uses your device's built-in sensor magnetometer to detect the electromagnetic field generated by a magnetic metal. When you move your phone a fluctuating magnetic field will be detected by this application.

The application will show the magnetic field level (EMF) in μT(microtesla) which is equal to ten times of mG(milligauss).

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The moment a metal is detected nearby the strength of the magnetic field should increase. The magnetic field values will constantly fluctuate. The moment the maximum value is reached an alarm will rind and the device will vibrate.The accuracy depends entirely on the device sensors.

Note: The magnetic sensor may get affected by electronic equipment nearby due to electromagnetic waves.

Sometimes the leather case on the device may have a magnetic snap or metallic accessory that can cause unwanted results and reduce accuracy.