The JJG 595-2002 standard specifies the methods of verification and technical requirements for color difference meters. It provides a systematic verification procedure to ensure the accuracy and conformity of color difference meters when measuring Color. The standard covers the steps, conditions and equipment and techniques required for verification to guarantee that the measurement results of color difference meters meet the specified standards and requirements. This is essential to ensure the accuracy and conformity of Color measurement, especially in areas where Color matching is required for Coatings, Printing and Miscellaneous.