Check the listing for details. Black and Decker SF100 Stud & Metal Sensor Finder LED Indicators. Color: Orange Black, Condition: Open box. Listed at 11.19 USD. Black and Decker SF100 Stud & Metal SensorNew - Never Used Detects wood studs up to 3/4 in thickSensor lights and beeps when stud is detectedLaser class iii wood stud sensors. Detects wood studs up to 3/4 inch thick. Sensor lights and beeps when stud is detected. Powered by 2 aa alkaline batteries [included]. A simple, yet indispensable tool that detects the location of studs in walls up to 3/4-inch thick. This compact, easy-to-use stud finder operates by moving over the surface of the wall. Led lights on the stud finder light-up to accurately indicate the location of studs. Compact design is easy to hold and use. Includes two aa alkaline batteries. Audio and visual indicators for working in noisy environments or where visibility is a problem. Detects studs from edge to edge for precision mounting.