Lat Was set up in 1993. At beginning of foundation, it focus on the research to the inspection and inspection measures of large-scale at huge construction and difficult problem for the position in the long distance measurement. From many years experiments, Lat developed new laser plummets, laser auto-levels and laser calibration theodolites more than 10 kinds of precision products which has reached world's level. The instrument are widely used for deformation observation of constructions, maintenance of high speed railway, installation of large equipments, manufacture of watercraft, constructions, maintenance of high speed railway, installation of large equipments, manufacture of watercraft, construction of nuclear station, inspection of elevators and inspection of lifting equipments. 5 inventions and 10 patents were coagulated on these new instruments. In this case, , Lat's products has a place to stand at domestic and international precision instrument fields because of their new technology. Lat's product meet with warm reception from customers and are sold to more than 10 countries in the world.