Zircon 61386 StudSensor Pro LCD Stud Finder The item is Zircon 61386 StudSensor Pro LCD Stud Finder Used for Test & Measurement, Rotary Lasers The product is manufactured in China In Stud Scan mode, finds the edges of wood or metal studs up to 3/4 in. (19mm) deep through typical drywall construction In DeepScan mode, finds the edges of wood or metal studs up to 1 1/2 in. (38mm) deep through thick construction such as plywood, paneling, or tile over drywall In any mode, continuously detects the presence of AC voltage Patented SpotLite Pointing System indicates targets Patented over-the-stud Indication alerts you if you start over a stud