Metrological testing is specifically for the calibration of metrological standard instruments. It tests whether these instruments meet the requirements of national metrological instruments and whether they are qualified. If they are unqualified, they cannot be used. Different metrological testing institutions and metrological testing institutes of different levels will have different metrological standards. What are the functions of metrological testing? 1. After the calibration of the measuring instrument, it can be determined whether your instrument can continue to be used. If your instrument is found to be non-compliant during the inspection, your instrument cannot be used again. If you use this unqualified instrument again, your product will be unqualified. 2. After the metrological testing, there will be relevant metrological reports and labels from the calibration agency, which can be used as materials to prove that your instrument meets the requirements and can be used. 3. In order to ensure the normal operation of the company, the company's instruments must be tested for metrology. Measuring instrument certification requires that the measuring instruments of the instrument calibration agency be calibrated. China's conformity assessment requires that the measuring instruments of the instrument calibration agency be calibrated. ISO system certification, company external audits, customer factory inspections, etc.