Stanley STHT77588-0 S160 Stud Sensor With its slim profile, the Stanley S160 Stud Finder is capable of detecting wood and metal studs up to 1-1/2\" below the surface. You can expect accuracy every time thanks to its centre marking channel and auto-calibration. It indicates what it is sensing below the surface with sequential LEDs and audible beeps and is best suited to locating live wire or studs when hanging pictures or mounting a television. Powered by 2 x AAA Batteries which come included. Features: This model is able to detect wood and metal studs at 1-1/2\" depth as well as live wires Its centre marking channel ensures accurate stud markings every time Features a slim profile for easy storage and portability Auto-calibration provides continuously accurate readings time and time again so you can rest assured you are gaining true results LED lights indicate stud direction and location Best suited to Locating live wire or studs, Mounting a television, Hanging shelves, Hanging pictures and Wall demo Specification: Height: 10.25 in Overall Length: 6.875 in Scan Depth: 1-1/2 in