In construction, a level measuring instrument is used to measure the flatness of the ground, the verticality of the walls, the levelness of beams and slabs, etc., to ensure the stability and safety of the building structure. In road construction, a level gauge is used to measure the smoothness of the roadbed, the slope of the road surface, etc., to ensure the smoothness and drainage performance of the road. In bridge construction, a level measuring instrument is used to measure the verticality of bridge piers, the levelness of bridge decks, etc., to ensure the stability and load-bearing capacity of the bridge. During the installation process of the equipment, the level measuring instrument is used to ensure the levelness of the equipment base, in order to ensure the normal operation and stability of the equipment.