KS B5531-1995 The Shore hardness gauge is a Korean national standard that standardizes the requirements for the hardness benchmark used in Shore hardness testing. The standard specifies in detail the manufacturing requirements, size specifications, hardness range and calibration method of the benchmark to ensure its accuracy and repeatability in the Shore hardness test. As an important tool for calibrating and verifying the Shore hardness gauge, the standard also clarifies its identification, storage and use precautions to ensure the long-term stability and measurement reliability of the benchmark. This standard is applicable to the calibration and quality control of hardness testing equipment, providing a unified technical basis for Shore hardness measurement, and is an important reference for equipment calibration and measurement standardization in related fields.