Features： 1、Locate Stud Edge: The stud finder features edge detection to locate the stud edges of wood and metal studs. It is highly accurate in its positioning. 2、Designed for Long Lasting: This stud finder has has a shock and water resistant body, it is durable and it has a long life span. Big value for money. 3、Surface Difference Wallpaper: There will be no difference in stud sensor functionality on surfaces covered with wallpaper or fabric, unless the cover used contains metal foil or fiber. 4、Safe and Reliable: The stud finder is very practical and a necessary tool when you are repairing at home. It can quickly help you find wires and keep you safe. 5、Wide Use: This stud detector quickly locates wood, metal, and AC wires in the wall, floors, and ceilings of the house. Helping you avoid danger when mounting TVs, cabinets, garage racks, etc. Specification： Item Type: Stud Finder Material: Plastic Weight: Approx. 73g/2.58oz Size: 136x23x50mm/5.35x0.91x1.97in Battery (Shipped without Battery): 1x9V 6F22 battery At 35 to 55% Relative Humidity: Depth Range Accuracy: Scan and mark studs from both sides: up to 3/4 inch (19mm) through wall Stud Centers: Wood ± 1/8inch (3mm), Metal ± 1/4inch(6mm) Impact Resistance: up to 3ft(1m) Drop to Concrete Operating Temperature: +20℉ to +120 ℉ (- 7 DegreeC to + 49 DegreeC) Storage Temperature: -20℉ to -150℉ (- 29 DegreeC to + 66 DegreeC) Uses: Inspection of Wall Studs, Metal Pipes and Wires Package List： 1 xStud Finder 1 x English Instruction