The Zircon StudSensor e30 quickly and easily locates the edges of wood and metal studs behind walls. It features a new user-friendly interface and improved SpotLite Pointer. Its patented pinch grip and contoured shape provide an easy, secure hold in either hand, at any angle Locates the edges of wood or metal studs up to inch (19 mm) deep "Ready" light indicates when calibration has completed successfully Red arrows light up sequentially as the stud finder nears a target "Edge" light indicates when the tool is over a stud edge SpotLite Pointer shines an arrow-shaped light on the wall to mark the target WireWarning detection indicates the presence of live, unshielded electrical wiring up to 2 inches (51 mm) deep Should scanning begin over a stud, Zircon's patented "over-the-stud" indication alerts the user to start the scan in a new location Should scanning begin over a stud, Zircon's patented "over-the-stud" indication alerts the user to start the scan in a new location