1、MAIN FUNCTIONS: The 5 in 1 stud finder is used to detect the center position of wood stem, metal position and live wire in the wall of wood and gypsum board materials, and has AC warning function 2、WITH ALARM DESIGN: The stud finder wall scanner alarm is designed to keep you informed of the wall condition at all times for more accurate operation 3、FAST POSITIONING: Wall stud finder can quickly and easily locate metal studs, joists, metal tubes, rebar, live AC wires behind wall, floors, and ceilings 4、WIDE RANGE OF APPLICATIONS: Electronic stud detector can clearly identify which objects inside the wall, more intuitive and accurate. Suitable for wood detection, metal detection, current detection 5、FAMILY ESSENTIAL TOOL: Wall wood metal detector sensor is convenient, durable, simple to operate, can sense the change of space density behind the wall, is a family practical tool Item Type: Stud Finder Wall Scanner Model: SH401 Material: ABS Power Supply: 1 x 9V dry battery(not include) Measuring Range: Wood Detection Level: I: 1/2 inch (12.7 mm) II: 1 inch (25.4 mm) III: 1-1/2 inches (38 mm) Metal Detection: 2.36 inches (60 mm) AC Detection: 2 inches (51 mm) 1 x Detector 1 x User Manual