About this product:? High Accuracy Stud Finder:Sensor Advanced sensor technology can accurately and quickly locate metal wood AC line.It is used to detect the center position of metal or wood studs in the wall.In addition, it can detect metal and voltage features in the wall, and whether the wires in the wall are live. Whether you are a professional or a DIY enthusiast, you can find great use in this digital stud scanner.? 4 in 1 Multifunction Wall Detector: The digital wall scanner includes four different scanning modes for wood, beams, joists, metals, AC wires and deeply recessed objects. The deep scan locates the center and edges of wood and metal studs up to to 1.5 inches deep; Metal Scan detects metals up to 2.36 inches deep; AC scan detects live unshielded AC wires up to 2 inches deep. easy-to-read LCD display: The digital stud scanner features a large LCD display with a large audible warning to detect the precise location of objects. When you find the material, the LCD screen shows the direction and the intensity of the beep tells you if you are closer to the target. Rapid detection saves time and effort for users, making it easier to complete tasks. ? Autocorrect function: When the beep sound and the screen disappear, place the wooden beam sight on the wall, open the stud sight and complete the calibration. Automatic calibration before use provides users with maximum reliability and accuracy. Then put it on the wall. After picking up the edge of the upright, the wooden beam sight will flash and beep. Safety Protection: The stud finder can quickly locate wood, metal and AC wires hidden in the walls, floors and ceilings of homes. It can work on different wall surfaces, such as slats, wallpaper wood floors, soundproof ceilings, whitewashed walls, etc. Helps you avoid hazards when installing TVs, cabinets, garage shelves, etc. Product Description: The Stud Beam Finder is a device used to determine the exact location of structural studs behind drywall. This multi-scanner stud finder uses electronic signals to quickly locate the edges and center of metal, studs, joists, pipes, live AC wire behind walls, floors and ceilings. ? Feature: 1. Detect both wood and metal rods and the wall thickness is 1 1/2" (38mm). 2. Detect metal pipes with a wall thickness less than 2.36 inches (60 mm). 3. Detect the wires in the wall, the wall thickness is 2 inches (51mm).? How to use an electronic stud finder? Step 1: Install the 9v battery (not included in the package) and choose the mode. Step 2: Place the device flat on the wall. Then press and hold the button while holding the device steady until calibration is complete (1-2 seconds). When calibration is complete, the unit will emit a short beep and the display bars will clear.Step 3: While holding down the button, move it along the area to be scanned.Step 4: When the stud finder detects an object, it beeps continuously and displays on the LCD screen. Please Note: This stud finder can quickly locate metal, studs, joists, pipes, live AC wire behind all kinds of walls, floors and ceilings, but excluding panel wall cement and brick wall, you can use it on popcorn ceilings, plaster walls, textured surfaces, drywall, etc.