1. Accurate Wall Scanner: Stud Finder uses a state-of-the-art sensor system that has been tested and upgraded over the years to ensure its accuracy. It can quickly locate stud wood metal and live AC lines. Whether you're a professional or a homeowner or a DIY enthusiast, you can get huge bang for your buck with this handy tool. Simply calibrate this tool before each scan to drill. 2.4-in-1 Scanner Plus Depth Detection: The Wall Scanner includes four different scanning modes for wood, beams, joists, metal, AC wires and objects deeply buried behind floors, ceilings and walls. STUD mode can detect wood beams and joists in drywall up to 3.8 cm. METAL mode can detect pipes, rebar, aluminium and copper up to 6 cm. Alternating current is suitable for voltage and live wires to a depth of 5.1 cm. 3. Upgraded LED display and clear sound warning: The wall stud sensor has a large LED screen display and loud and clear sound warning. When moving the tool along the wall, LED on-screen indicators will give you clear direction and accurate object position, and its audible warning will show the edge or center of objects on the wall. This will make your DIY projects easier and faster. 4. Auto-calibrate for efficient scanning: When turned on, the stud finder will auto-calibrate. 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 modes, the calibration is performed over the air. Then you'll get accurate warnings to avoid drilling holes in metal or AC wires or other mishaps. 5. Multifunctional: This wall detector can quickly find the metal and wood AC wires hidden behind the house walls. Helps you in installing TVs, cabinets, garage shelves and more. Shipping Quantity: 1 PieceProduct color: grayProduct size: 17.2*7.6*3.7cmWithout battery