Ball Valve,Brass Ball Valve,Ball Valve Aluminum Handle,Forged Brass Ball Valve Zhejiang minmetals huitong import and export Co., Ltd , https://www.zjminmetals.com Figure 1 shows the SGC digital altimeter developed by our company. It is a vertical single-coordinate movable intelligent length measuring instrument. It uses a high-precision grating scale as the length reference to measure the geometric dimension of the device under test. It can measure the diameter of the hole and the axis, the height distance between the plane and the plane, the plane and the center, and also measure the geometrical error of the center distance. project.