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.
If there is any metal in the area, the strength of the magnetic field should increase.
i use it to find electrical wires in walls (like a stud finder) and iron pipes in the ground.
or when drop a needle.
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