Document reporting the results of the calibration. The document must include the customer’s personal data, the instrument’s personal data, relevant information on the conditions, methods and traceability of the calibration, the measurements accompanied by the relative measurement uncertainty. The accredited Calibration Certificate guarantees the traceability of the measurements and can be used to transfer the traceability within the organisation using it. An accredited calibration certificate is also sufficient to demonstrate the competence and impartiality of the issuing laboratory, which is necessarily accredited according to ISO/IEC 17025. Those who rely on an accredited calibration do not need any further assessment of the calibration provider to comply with the requirements of ISO 9001.