YAJU CENTER FINDING - AC wire warning flag will show on the LCD when live wires are monitored within 1M. If you wanna make sure there is live wire, please detect only in the AC mode and calibrate repeatly. Show Column will elevating as wood stud finder approach item& 39;s center, and the highest column site is the center of studs. Beep sound will remind you when you find the target. WIDE DETECTION RANGE - The maximal detection range of metal parts: 3-inch; AC wire: 2-inch; Stud parts: 1.5-inch. Easy to find the stud center and edges, accurately locates metal pipes, live wire, stud, wooden frames, rebars and joists which hidden behind walls, floors and ceilings. Please pay attention that it cannot be detected if exceeding the detection depth. Note - It is difficult to detect the wire with the ground wire. It does not apply to slats and plaster walls; rusting of items may affect detection results; depth of inspection may vary depending on wall moisture, wall texture, paint, etc. There are 3 different depths to choose from in the spiral mode, and the 12 mode is most often recommended. LARGE BACKLIT SCREEN - The Finder come with LCD backlight, you can read the value clear even in low light conditions. Detection mode, center pointing, low battery indication can be shown on the screen. Audio indicator will beep for reminding. MULTIPLE USES - It& 39;s a great tool for plumbers, contractors, carpenters, masons, home renovators, construction workers, electricians, DIY enthusiasts, and others who need reliable detection. Excellent product can meet all your detection needs. Upgraded Stud Finder This Wall stud finder quickly and easily locates the edges and center of metal studs and joists behind walls, floors and ceilings. Its easy-to-read display screen indicates directions, edges and center of studs, while Wire Warning detection indicates the presence of live AC voltage Features 1. Stud mode: detect metal studs with 1/2 inch, 1 inch and 3/2 inches mode 2. Metal mode: detect metal pipes, rebars etc up to 3 inches 3. AC mode: detect unshielded AC live wire up to 3 inches Important Tips: 1. Calibration: Place it flat on wall first. Then press and hold the Scan button. 2. keep the unit still until calibration is complete(1-2 seconds). 3. When calibration is complete, the display bars will be cleared Operation. 4. Keep it flat against the wall and move the unit slowly. 5. Do not rock or lift it. 6. Detection depth and edge detection can vary due to moisture content of materials, wall texture, paint, etc. Notice: Smart Beep Function: A beeping sound lets you know when the scanner has detected a stud and also assists you with the initial device calibration. Size15*78*3cm Package Includes: 1x Stud Finder (Not Package with Battery)