Metal Detector 2 PRO (Magnetometer) is using your device magnetic sensor to detect magnetic field values around device, and turn it in real magnetometer. NO internet connection is required for usingapp.
Metal Detector app is simple to use, just open it and move it around. If the magnetic field values rise there is metal in the area. Accuracy of the app is entirely dependent on the magnetic sensor inyour device and is affected by electrical equipment. If the app does not work as it should then the problem is in your magnetic sensor. Maybe your device does not have one. Or try to initialize the sensors by pointing your phone up and rotate it in afigure 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 metalelements remove the case before using the app.