A surface roughness tester is a high-precision instrument designed to measure the surface finish of various machined components. It is capable of measuring flat, inclined, cylindrical, curved, internal bore, groove, and deep groove surfaces. Widely used in industries such as automotive manufacturing, higher education, machining, printing and packaging, mold processing, electronics and telecommunications, and glass and ceramics, the instrument offers high accuracy, a wide measurement range, and easy operation. It is portable, stable in performance, and features large data storage capacity, low power consumption, and automatic sleep functionality.