Metrological traceability is the property of a measurement according to which a given result can be related to a reference through a chain of documented uninterrupted calibrations, each contributing to the measurement uncertainty (“International vocabulary of metrology – Basic and general concepts and associated terms – VIM”).

Calibration certificates, issued under accreditation, ensure that measurement results are traceable to the International Measurement System (SI) and can be used to provide metrological traceability.

The calibration reports, issued outside the accreditation, can be referred to the international system of SI measures of the measures, but can not be used to disseminate the traceability within the company receiving the report.