
You can turn ON or OFF the alarm sound and if the app shows you an inaccurate reading then there is an option to caliber your device. However the accuracy of detecting the objects in your surrounding depends totally on the sensors of your phone. Also, it can't detect some stuff like aluminum metals, coins, etc.
Color indication: If it's showing...
- Green, that means, magnetic field level in nature is within tolerance.
- Red, that means, magnetic field level is too high, indicating that there is a metal object nearby.
Check this video to see how it works

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