Quickly and easily locates the edges of wood and metal studs up to 3/4 in behind drywall. The patented SpotLite Pointing System shines a beam of light on the wall to identify the target. Red LEDs light up every time a stud edge is approached. The patented SpotLite Pointing System, an audio alert, and a green LED signals when the stud edge is reached. Should scanning begin over a stud, the over-the-stud indicator alerts the user to start the scan in a new location. TruCal technology calibrates to any wall'sdensity and a steady green LED TruCal light alerts the user.