High Precision Stud FinderAdvanced 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 functions 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. Easy to Read LCD ScreenThe digital stud scanner has a large LCD screen with a loud warning sound to detect the precise location of objects. When you find the material, the LCD shows the direction and the intensity of the beep tells you if you are closer to the target. Rapid detection saves users time and effort, making it easier to complete tasks. Auto Correction FunctionWhen the beep sound and screen disappear, place the wooden beam viewfinder on the wall, open the stud viewfinder 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 stud, the wood beam sight will flash and beep. The stud finder is a device used to determine the exact location of framing studs located 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. How to use an electronic stud detector 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 still until the calibration is complete (1-2 seconds). When the calibration is complete, the device emits a short beep and the display bars clear. Step 3: While holding the button, move it along the surface to be scanned. Step 4: When the stud finder detects an object, it will beep continuously and display 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 except cement board wall and brick wall, you can use it on popcorn ceilings, plaster walls, textured surfaces, drywall, etc.