Dr.Meter Wall Stud Finder This Dr. Meter Fi-1 wall stud finder quickly and easily the edges and center of metal studs and joists behind walls, floors and ceilings. Its easy-to-read display screen directions, edges and center of studs, while Wire Warning detection indicates the presence of people AC voltage Features - Stud mode : detect metal studs with 1/2 inch, 1 inch and 3/2 inches mode - Metal mode : detect metal pipes, rebars etc up to 3 inches - AC mode : detect unprotected AC people wire up to 3 inches momentous Tips - Positioning : For straitlaced use, always place this product multidimensional against the surface before powering on - Power on : Press and hold the Scan button continuously while in use - Calibration : Place it multidimensional on wall number one. Then and hold the Scan button, and keep the unit still until calibration is perfect -LRB- 1-2 seconds -RRB-. When calibration is perfect, the unit will a shortsighted beep and the display bars will be cleared - Operation : Keep it multidimensional against the wall and move the unit slowly. not rock or lift it - While calibrating, the device must not be placed directly over a stud, heavy material such that as metal, or over a blotto or newly painted area, or it will not properly calibrate. If all segments of the section LCD parts flash on and off, and intermittence when the activation button is pressed, move the device to a diverse location, release the activation button and try to calibrate again - Detector will not detect AC people wire from a shielded position - Before scanning, please check the thickness of the position be detected is fit for detection - Detection depth and edge detection can vary repayable to wet content of materials, wall texture, paint, etc Package Contents 1 x Stud Finder 1 x 9V Battery 1 x User vade mecum .