Model LL-1 Laser level are noted for their novel shape,simple structure, convenient operation,stable function,easy to carry,etc. It is widely used for building works,such as marking elevations,site layout,door or window installations,pipework,installing fences etc;also,it can be used for other works,such as setting cabinets, installing bathroom tile,ceiling grids,and installing floor tiles,etc. Main performance External dimensions: 215?4?9(mm) range: >25m weight: 260g(not including batteries) batteries: three AAA batteries,running work 4?6 hours. life: >10000 hours Collimation light beam divergency: ?1mrad Collimation light beam angle deviation: ?3? Level bubble precision: 30?/2mm