StudSensor Pro SL-AC stud finder locates the edges of wood and metal studs and joists behind walls, floors and ceilings. Patented SpotLite pointing system shines a beam of light on the wall to identify the target and WireWarning detection indicates the presence of live AC voltage. Its tough, ergonomic housing withstands everyday jobsite use.Stud scan mode locates the edges of wood or metal studs up to 3/4 in deepDeepScan mode doubles the scanning depth to 1-1/2 inRed LEDs light up every time a stud edge is approachedPatented SpotLite pointing system and green LED signals when the stud edge is reachedWireWarning detection indicates the presence of live, unshielded electrical wiring up to 2 in DZircon’s patented “over-the-stud” indication alerts user to start the scan in a new location if scanning begins over a studBattery cover also doubles as a belt clip