<h3>Wide Application</h3>This finder can be used to detect the center position of the wood rod in the walls of wooden boards and plasterboard, as well as the position of metal and AC wires, so you can accurately locate install TVs, cabinets, drill holes in the wall, etc. </p>You must calibrate the detector before each scan. First select the mode, then press and hold the scan button (on the right side of the tool) to calibrate the tool. The calibration is complete when the attenuation bar disappears and a beep sounds. If you accidentally shake the scanner, you will need to recalibrate the device. In metal/AC mode, you need to place it in the air to calibrate it. </p><h4>Specification</h4><ul><li>Color: Black and Silver</li><li>Package Included:</li><li>Wall Detector*1</li><li >Battery*1</li></ul>