Ergonomically designed grip allows a comfortable hold on the tool for any size hand, at any angle..Center marking pin provides a visual reminder of stud location.Auto calibration for consistent readings, LED Arrows and Audible Notifications of Stud Location..With the help of this stud finder, you can quickly locate wood, metal and AC wires hidden in the walls or ceilings of the house to help you avoid potential serious issues when you install TVs, cabinets etc..Three deep studscan: Locates the center and edges of wood and metal studs up to 1⁄2 in. (13 mm), 1 in. (25 mm), 1½ inches deep. Metal Scan Mode: Detects metal up to 2.36 in. (60 mm) deep. Magnetic metal scan-Detects magnetic metal up to 3.14 in(80mm)deep. AC Scan Mode: Detects live unshielded AC wires up to 2 in. (51mm) deep.This stud finder tool is a handheld instrument for rapid wall testing, mailly used to detect hidden walls, magnetic metals in the ceiling and floor, such as steel bars, iron pipes. Non-magnetic metals, like alminum pipes, copper pipes. Non-metals, like wooden beams, PVC water pipes, and AC wire.