The Stud Sensor e30 quickly and easily locates the edges of wood and metal studs. It features a new user-friendly interface. An improved Spot Lite Pointer shines a beam of light on the wall to identify the target and Wire Warning detection indicates the presence of live AC voltage. Its new patent-pending p inch 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 3/4 in. deepNew "Ready" light indicates when calibration has completed successfullyRed arrows light up sequentially as the stud finder nears a targetTruCal'' instant calibration ensures accuracyUpdated Spot Lite Pointer shines an arrow-shaped light on the wall to mark the targetUses a patented sensor that pinpoints the edges of wood or metal studs behind walls floors or ceilingsExclusive patented Spot Lite Pointing System shines a bright beam of light over stud edges