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. 1 x Stud Finder1 x English Instruction Item Type: Stud FinderMaterial: PlasticWeight: Approx. 73g/ 2.58ozSize: 136x23x50mm/ 5.35x 0.91x 1.97inBattery (Shipped without Battery): 1x9V 6F22 batteryAt 35 to 55% Relative Humidity:Depth Range Accuracy: Scan and mark studs from both sides: up to 3/4 inch (19mm) through wallStud Centers: Wood ± 1/8inch (3mm), Metal ± 1/4inch(6mm)Impact Resistance: up to 3ft(1m) Drop to ConcreteOperating Temperature: +20℉ to +120 ℉ (- 7°C to + 49°C)Storage Temperature: -20℉ to -150℉ (- 29°C to + 66°C)Uses: Inspection of Wall Studs, Metal Pipes and Wires