The 3D laser level meter can emit visible lase horizontal and vertical lines for the automatic leveling separately or simultaneously. Provides accurate horizontal and vertical datums for indoor construction stakeout and calibration, easy to operate, and versatile. Suitable for flooring tile layout, paneling, wallpapering, stenciling, wainscoting, finish carpentry,wall stud layout and partition installation. Features: Output 12 laser lines for finer positioning, with self-leveling system, flexibility and stability. 1/4" screw size for easy connection, it can be used with tripod to adjust the working height of the machine. Waterproof and dustproof, suitable for both indoor and outdoor use. Adopts optical , K9 material, fine transmission, with clear laser light. Equipped with self-test calibration function, 3 automatic leveling, but if the angle is over 3, the laser light will keep blinking reminding you to reset them on a flat ground. Rotation knob design, clockwise rotate to open it, anticlockwise rotate to close it. Two touching buttons design, one OUT/H button, one V button, horizontal line and vertical line with a clearly division. The button is wear resistant, with high sensitive to switch the line mode quickly, and with comfortable hand feeling. Easy to carry with the case, providing quick and convenient mobility and storage. Note: The laser output maker is located on the output hole. Do not stare directly at the laser light. Do not disassemble the instrument. This instrument meets the laser radiation safety rating standard. Specifications: Main material: plastics+metal Battery: 2 * rechargeable battery, 3.7V, 4800mAh (included, you will find there are two 18650 batteries inside if disassemble one) Laser ray: 3D, 12 lines Range: 30m Laser lines accuracy: 0.2mm/m Laser light color: green light Self-levelling-range: 3 Leveling time: 4s Laser class: 2 Working temperature: -10 to 40 Storage temperature: -20 to 70 Moisture: 90% Continuous time: 3-9 hours