Adopting precise measurement methods and professional measurement software，the roughness and cylindricity tester are based on high-precision air floating spindle, and are composed of imported precision circular gratings, precision inductive displacement sensors and computers. Roughness and cylindricity tester measure the angle and radial displacement of the measured workpiece to ensure the accurate measurement of the angular displacement and radial value of the measured workpiece. They are not only widely used in mechanical processing, automobile and motorcycle parts, bearings, motors, electric tools, precision tools, precision hardware, tools, molds, optical components and other industries, but also used in scientific research institutes, colleges and universities measurement institutions and enterprise measurement room workshops, as well as military enterprises of the ministry of aeronautics and astronautics.