2022-09-11 00:00:00 This app detects metal objects nearby you by measuring electromagnetic fields using the phone's build-in magnetic sensor. The magnetic field level (EMF) in nature is about 30~60μT (microtesla). If there is any metal in surrounding , the value of the magnetic field will increase. Make sure you are not around your electronic devices (TV, PCs etc. ) . This will affect the Metal detector magnetic field values due to these devices electromagnetic waves. important!!!