Zircon StudSensor e40 Electronic Stud Finder Locates the edges of wood or metal studs up to 3/4-Inch (19mm) deep DeepScan mode doubles the scanning depth to 1-1/2-inch WireWarning detection indicates the presence of live wire up to 2" New "Ready" light indicates when calibration has completed successfully Updated spotLite pointer shines an arrow-shaped light on the wall to mark the target