ISO 7700-1 is a standard published by the international standards organization (ISO) that specifies the methods used to check the moisture meter performance of grains. Applying to a wide range of grains including barley, wheat, maize, oats, rye, sorghum and rice, the standard aims to ensure the accuracy and Reliability of moisture meters in use through a standardized calibrating and testing process. The standard details pre-calibrating preparation, the calibrating process, testing methods and interpretation of results, providing uniform guidance for manufacturers, users and calibrating bodies. By following this standard, the performance of moisture meters can be effectively evaluated and whether adjustments or repairs are required, thus ensuring the accuracy of grain moisture measurement and supporting quality control and trade fairness in the food industry.