The measuring and testing equipment shall be clearly marked with "qualified", "disabled" and "sealed" to indicate the state of measuring instruments. (1) is qualified, which can meet the requirements of quality inspection, inspection and test accuracy after weekly inspection or one-time verification;
(two) stop using, verification is unqualified or seriously damaged or defective in use;
(3) seal up, that is, according to the frequency of use and production and operation, suspend use. When the sealed measuring instruments are reused, they can only be used after passing the verification.