A measuring instrument is considered to deliver traceable results if they are referenced to a national or an international standard through an unbroken chain of comparisons, all having stated uncertainties. Therefore, verification of traceability ensures international comparability and, thus, the reliability of measurement results.
Important information: In many countries, only accredited calibration certificates or certificates issued by national metrology institutes are accepted as evidence of metrological traceability. No other calibration certificates (e.g., ISO calibration certificates or verification certificates) are valid as forms of evidence. For further information, visit International Laboratory Accreditation Cooperation.