Zircon StudSensor e30 Electronic Stud Finder Locates the edges of wood or metal studs up to 3/4-Inch (19mm) deep WireWarning detection indicates the presence of live, unshielded electrical wiring up to 2 inches (51mm) deep Updated SpotLite Pointer shines an arrow-shaped light on the wall to mark the target All-new Patent-Pending Pinch Grip Design Patented TruCal technology indicates when the tool is calibrated and ready