Sperry Instruments PD6902 5-In-1 Multi-Scanner & Electrical Tester, 120V AC, Stud Finder, Metal Scanner, Non-Contact AC Voltage Detection, GFCI Test Functionality, Audio & Visual Indication, 2 Pc. Kit,Gardner Bender,PD6902" /> Combined multi-scanner and electrical tester simplifies installation of electrical boxes, switches and outlets 3-SELECTABLE MODES: stud scan, metal scan, or AC voltage detection. Detects metal pipes or objects to a maximum depth of 2 -  in. drywall Non-contact AC voltage detection (50-600VAC) to maximum depth of 3.5 -.5 inch drywall. Scans and locates wood or metal studs at a depth up to .75 inch. Durable heavy-duty design with over-molded rubber grips Integrated 3-wire circuit analyzer with GFCI test functionality. Built-in metal tip for marking stud edge, pipe location or desired mounting point