StudSensor™ Pro SL quickly and easily locates the edges of wood and metal studs and joists behind walls, floors, and ceilings. The patented SpotLite® Pointing System shines a beam of light on the wall to identify the Vanderhoof Hardware Company Inc.. Stud Scan mode locates the edges of wood or metal studs up to 3/4" (19 mm) deep DeepScan® mode