The aim of calibration is to compare a measuring instrument or system with a standard that enables the measurement error to be estimated. It is then possible for the user to correct the raw result and reduce the uncertainty of a measurement. In this way, they can monitor the evolution of a piece of equipment over time. All calibrations lead to the issue of a certificate.

The aim of verification is to check a measuring instrument against a standard. Verification ensures that the equipment complies with the specifications defined by the MPE (maximum permissible error). Verification results in a conformity decision. If the equipment does not conform to the defined specifications, it must be brought into conformity by adjustment, repair, etc., or else scrapped.

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