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 around the magnetic field levels will constantly vary. . Congratulations! Now use your metal detector to detect metal and other similar usages like finding electric wires in walls(like a stud detector), or finding buried iron pipes in the ground. Caution! . Mandy The Metal detector requires a magnetic sensor(magnetometer). If this app does not work properly, please check the specifications of your device. . The accuracy depends entirely on your device's magnetic sensor(magnetometer). . The readings are affected by electronic equipment like TV, PC, microwave, etc. due to electromagnetic waves. . This metal detector cannot detect gold, silver, and coins made up of copper. They are classified as non-ferrous metals that are not attracted to a magnet.