Specialized equipment category for quantitative evaluation and measurement of surface characteristics of products and materials. Includes surface roughness measuring instruments, hardness testers, friction coefficient measuring devices, contact angle measuring instruments, surface tension meters, and others. Used in quality control, material development, and product inspection to accurately assess physical and chemical properties of surfaces. Essential measurement equipment group for quality assurance in manufacturing sites, including applications such as finish quality verification of machined products, coating effect validation, and adhesion evaluation.