Ningbo Jixing Mechanical Manufacturing Co., Ltd has perfect inspection equipment, such as CMM, which can be defined as a detector that can be moved in three directions, on three orthogonal rails. Such detector transmits signal by contact or non-contact method. Displacement measurement system of three axes (e.g. optical ruler) calculate each coordinate (X、Y、Z) and each function of workpiece by data processor or computer. Measurement function of CMM shall include accuracy measurement on dimension, position, geometry, outline, etc. Any shape is composed of three-dimensional space points, all the geometric measurement can be attributed to the measurement of three-dimensional space points, so accurate collection of spatial point coordinates is the foundationto assess any geometric shape .