The StudSensor™ L50 stud finder locates the edges of wood and metal studs and joists behind walls, floors, and ceilings. Its easy-to-read display screen indicates stud edges, SpotLite® Pointer shines a beam of light on the wall to clearly identify the target, and WireWarning® detection indicates the presence of live AC voltage. Its patented pivot pinch grip and contoured shape provide an easy, secure hold in either hand, at any angle. StudScan mode locates the edges of wood or metal studs up to ¾ in. (19 mm) deep DeepScan® mode doubles the scanning depth to 1 ½ in. (38 mm) READY icon displays when calibration has completed successfully Easy-to-read LCD display indicates when a stud edge is approached Zircon's patented “over-the-stud” indication alerts user to start the scan .