Wall Sensors, Scanners, and Stud FindersMultiScanner Pro SLTurn off stud and metal scan to look only for hot AC wires. SpotLite Pointing System projects a beam of light on the wall when MultiScanner Pro SL has located the edge of a stud.Professional Multi Scanner Electricians Stud Sensor, Scan Depth 3 Inches, Scans Drywall, Wood, Paneling, Concrete, Most Floor, Wall, Ceiling Coverings, With A/C Tracking