1.【Accurate wall scanner】: The stud detector uses the most advanced sensor system to ensure its accuracy after years of testing and upgrades. It can quickly locate stud wood metal and live AC lines. Whether you are a professional, a homeowner or a DIY enthusiast, you can use this handy tool to get great benefits. Just calibrate this tool before each scan to drill holes. 2.【4 in 1 scanner plus depth detection】: The wall scanner includes four different scanning modes for wood, beams, joists, metal, AC wires and deep embedded objects behind floors, ceilings, and walls. STUD mode can detect wooden beams and joists in gypsum boards up to 3.8 cm. METAL mode can detect pipes, steel bars, aluminum and copper up to 6 cm in length. Alternating current is suitable for voltage and live wires with a depth of 5.1 cm. 3.【Upgraded LED display and clear sound warning】: The wall nail sensor has a large LED screen display and loud and clear sound warning. When moving this tool along the wall, the LED screen indicator will provide you with a clear direction and accurate object position, and its sound warning will show the edge or center of the object on the wall. This will make your DIY projects easier and faster. 4.【Automatic calibration for efficient scanning】: The stud detector will be automatically calibrated when you turn it on. Make sure to calibrate in a location where there are no studs or AC wires nearby. In STUD mode, you only need to calibrate on the wall. In METAL and AC mode, please calibrate in the air. Then you will get accurate warnings to avoid drilling holes in metal or AC wires or other accidents. 5.【Multi-function】: This wall detector can quickly find the metal and wood AC wires hidden behind the walls of the house. Help you find the exact studs when installing TVs, cabinets, garage shelves, etc.