A regular calibration: the implementation of calibration in accordance with the prescribed schedule, and divided into internal calibration, external calibration, exempt from calibration No need for calibration
B irregular calibration: product variation in the process or finished product transfer, or the use of the gauge in doubt, or the occurrence of the gauge progress of the damage or fall situation, should be notified to the management of gauges, instruments management unit or management personnel to calibrate. In addition to the newly purchased gauges, instruments in the acceptance of the calibration.
C Compulsory verification: the public standard of measurement, departments and enterprises, institutions use the highest standard of measurement, as well as for trade settlements, safety and security, medical and health care, environmental monitoring in four areas included in the mandatory verification catalog of the work of measuring instruments.