5 in 1 function: stud finder has 5 different scan modes. Three types of stud finder mode scan wooden beams and beams in walls with a thickness of up to 13 mm, 25 mm and 38 mm. The metal mode detects metal up to a depth of 60 mm. The AC scan mode detects live unshielded AC cables with a depth of up to 51 mm. Power Finder, Wall Scanner for Wood, Metal, AC Current, Beam Efficient and accurate: This wall scanner is equipped with a highly efficient, improved sensor, the LED screen display gives you a clear direction and accurate target position when you move this wall scanner along a wall, a beep tells you that the object has been found. You can quickly locate wood, metal posts, reinforcement rods as well as live AC cables in walls, floors and behind ceilings. Easy calibration: an on/off mode selection button and a calibration button make the bolt detector very easy to calibrate and use. In stud mode, simply calibrate on the wall, in metal and AC mode, please calibrate in the air. Please make sure they are calibrated in a place where there are no bolts or AC cables nearby. Multiple use: this cable detector is not only suitable for professional applications such as construction and industry, but also makes home DIY easier and safer. If you need to drill holes in the wall, hang artwork, mount a TV or install a light on the ceiling, it helps you avoid drilling in metal and AC cables in the wall. Customer ServiceThe wall line finder comes with 1 9V battery, you do not need to buy it separately. If you have any questions, please contact us and we will provide you with a satisfactory service.