Wide Application: This finder can be used to detect the position of the center of wood rod in the walls of wooden planks and plasterboard, as well as the position of metal and AC cables, so that you can accurately install TVs, cabinets, drill holes in the wall, etc. 4-in-1 detection mode: This stud finder has 4 different modes that can be switched: stud scanning , Deep Mode, Metal Scan and AC Scan. Multifunctional: Stud Scan is used to find and locate the center and edge of wood and metal studs with a depth of 19mm; The maximum deep scan positioning depth is 38 mm; Maximum metal detection depth reaches 60mm; AC Scanning can detect AC wires with a depth of 51mm. Screen display and alarm prompt: During the detection process, the display screen will show the detection mode , signal strength, direction indication, etc. Also, the intensity of the buzzer will vary depending on the distance between you and the target, you can mark the position with a marker when the sound is loudest. And it has AC warning function. Easy to calibrateYou need to calibrate the detector before every scan. You first select the mode, then press and hold the scan button (on the right side of the tool) to calibrate the tool. Calibration is complete when the dimming bar disappears and a beep sounds. In metal/AC mode, you need to place it in the air for calibration.