Yesterday I saw a friend on the forum raise the question "Does the purchase of measuring instruments with the CMC mark need to be inspected first?" Many measurement friends believe that the purchase of measuring instruments with the CMC mark cannot be exempted from inspection before use. It must be tested. I have a different opinion and I invite friends to discuss it. Most enterprises now use the ABC management model to manage measuring instruments. Generally speaking, Category A is mainly a measuring instrument for mandatory verification, Category B is a measuring instrument used for testing in important departments such as process quality, energy measurement, and business management measurement, while Category C is generally a measuring instrument that is easily damaged and consumable and does not perform measurements but only provides instructions. Measuring instruments for use or tools. Due to classified management, Class A and Class B measuring equipment must undergo weekly inspection or first calibration before being put into use. For measuring instruments under Category C management, as long as they have the manufacturer's factory certificate and the indication value is relatively stable, they can be based on the manufacturer's factory certificate and no calibration is required. As long as the appearance and zero position observation are qualified, it is sufficient. The registration ledger is put into use, and the management method is one-time use, and it will be replaced if it is damaged. Such as steel tape measures, steel rulers, glass measuring instruments, temperature instruments such as electronic temperature regulators for indication only, cabinet current and voltage meters, etc. Of course, if the company has relevant standards that can be used for calibration and verification, you might as well check them for the first time.