Metal Detector (Magnetometer) is using your device magnetic sensor to detect magnetic field values around device.
*Notes: -This application measures the magnetic field strength, which allows it to detect certain specific metals. You can not find gold or aluminum with this application.
-The accuracy and power of detection depends greatly on the quality of your device, specifically the specific sensors.
-If the readings are not good try to reset the sensors by pointing your phone up and rotate it in a figure 8 pattern. Remove magnetic covers from your device for accurate readings. Magnetic covers will influence the magnetic sensor in your Android device. If your device's case contains metal elements remove the case before using the app.