ASTM E 2975-23 standard test method is used for calibrate or calibrate verification of concentric cylindrical rotational viscometers. This method provides a reliable procedure designed to ensure the accuracy and conformity of concentric cylindrical rotational viscometers in the measurement of liquid viscosity. Through calibrate verification, ensure that the instrument can provide accurate results under different measurement conditions, thereby improving the Reliability of measurement and Repeatability of experiment. This standard is widely used in industrial and scientific research fields that require accurate measurement of liquid viscosity, especially in chemical, food, pharmaceutical and other industries, helping to meet the requirements of quality control and process monitoring.