[Reliable and Convenient Wall Scanner] The stud detector uses an intelligent microprocessor chip with the highest sensitivity which can precisely and detect wood, pipes, metal and AC wires hidden in the walls, floors and ceilings.Whether you are a professional, homeowner or a DIY enthusiast, you will make your home projects easier. [5 in 1 Stud Finder Deep Detection] The digital wall scanner has 5 scanning modes, includes 1/2 inch, 1 inch and 1-1/2 inch scanning mode to locate the center and edge of woods, beam, joist, metals or deeply embedded objects; Metal scanning mode to detect ferrous and non-ferrous metal up to a depth of 2.36 inches; AC scan detects unshielded 80 to 240 AC voltage lines up to 2 inches. [Automatic Calibration and Easy to Use] Turn on the stud finder, lay it flat , press the Scan Button and it is ready for calibration. When the wood, metal and AC wires hidden is found, the intelligent micro-sensor chip will flash and beep.Auto-calibrational the stud scanner makes easy to use and ensures that most objects behind the wall can be detected. Power supply: 9v batteryx (not included) Colour:black Material:plastic Size:152 x 62 x 28MM Package Contents: 1 x Stud Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.