Description: . This app measures the magnetic field with an embedded magnetic sensor. . The magnetic field level in nature is about 49μT(microtesla). . When any metal (steel, iron) is nearby the magnetic field levels will increase and the app will give beeps if the levels are too high. Directions for usage: . Calibrate the metal detector app by waving your phone in an infinity loop( or a figure of '8') once the app is opened. . Now while keeping the app open move your device arou