The Zircon 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 target. In StudScan mode, locate the edges of both wood and metal studs up to 19 mm deep. DeepScan mode doubles the scanning depth up to 38 mm deep. Utilize the dual scan and mark procedure for increased accuracy.