The level meter can emit visible horizontal and vertical lines for provides accurate horizontal and vertical datum for indoor construction stakeout and calibration, easy to operate, and versatile. Equipped with self-test calibration function, ＜4 automatic leveling, but when over 4, the light will keep blinking and beep sounds to remind you to place it on a flat ground. Suitable for flooring tile layout, paneling, wallpapering, stenciling, wainscoting, finish carpentry,wall stud layout and partition installation. You can have a try.Specifications:Name: LevelMaterial: plastics+metalBattery: 2* AA battery (not included)Color: black, blue(optional)Wavelength: green light 520nmHorizontal/vertical accuracy: 0.3mm/mSelf-levelling-range: 3Waterproof grade: IP54Working distance: 10mGreen light working temperature: -5 to50Leveling/compensation ranges: 41Item weight: 213g/ 8.11ouncePackage size: 174* 160* 100mm/ 6.85* 6.30* 3.94inPackage weight: 537g/ 18.59ouncePacking List:1* Level Machine1* Wall Mounted Bracket1* Iron Board1* Guideline1* Carrying Bag