This Zircon StudSensor(TM) L20 stud finder is ideal for your installation or renovation projects. It has a patented pinch grip design for a comfortable hold in either hand. With its easy-to-read display and its SpotLite® pointer, it clearly identifies the edge of the stud when it scans over it. The "READY" light indicates when calibration has completed successfully. It can locate edges of wood or metal studs in walls up to 3/4" deep and features a V groove for an accurate marking of the stud. This product is backed by a 1-year warranty.