This app measures magnetic field value using the built-in magnetic sensor that is built into your device. The magnetic field level(EMF) in nature is about 49μT(micro tesla) or 490mG(milli gauss); 1μT = 10mG.

Metal Detector is an Amazing tool that uses magnetic sensor to find the metal surrounding you.
If there is any metal in the area the strength of the magnetic field should increase.
Turns your cell phone into a real metal detector making your friends and family jealous about your phone

The accuracy depends entirely on the sensor in your device. Note that the magnetic sensor is affected by electronic equipment (TVs PCs etc.) due to electromagnetic waves.

Usage is simple: Open this app on your device and move it around. The magnetic field level will constantly fluctuate. That's it!

Note : magnetic sensor is affected by electronic equipment (TVs PCs etc.) due to electromagnetic waves. This is not a bug in the app.