"JJF (Mechanical) 061-2009 Black and White Diffuse Transmission Density Meter calibrating specification" standard specifies the calibration method of black and white diffuse transmission Density Meter. The standard aims to ensure that the Density Meter provides accurate and reliable measurement results in the measurement process. Through standardized brbrating procedures, instrument errors can be effectively excluded to ensure the accuracy and conformity of the instrument in practical applications. The standard describes the equipment, steps and operating conditions required for instrument calibrating in detail, covering the reference materials used in the calibrating process, test environment and specific operating requirements. It is suitable for calibrating all kinds of black and white diffuse transmission Density Meters, especially in the fields of laboratory testing and production monitoring, to ensure that the measurement results meet regulatory requirements and industry standards.