Laser leveler comes in handy when it comes to measuring, and the Multipurpose Laser Leveler comes in 6 modes: Crossline, Laser point indicator, Ground level line, Vertical line, Level line, as well as the LED Night view. It also comes with vertical and horizontal water columns and LED indicators. Definitely a must-have lightweight and practical measuring tool! How to use: Set the leveler on the tripod or a stable surface, adjust the leveler. Switch on the leveler and it will show top green indicator light while emitting a laser beam. Turn the instrument, the laser beam toward goals. Gently adjust knob, find work orientation. When work is over, turn the switch knob counterclockwise, turn off the leveler. Specifications: Laser wave-length: 630-680nm Output power: