The laboratory shall set up and keep the metrological traceability of its results through a series of calibrations that is documented and has no gaps that ties them to a suitable reference, every calibration in the series adding to the measurement uncertainty. It shall make sure results trace to the SI through calibration by a competent laboratory, through the certified values of reference materials from a competent producer whose traceability to the SI is stated, or through realizing SI units directly, confirmed by comparing with national or international standards, directly or indirectly. Where tracing to the SI is not technically possible, it shall show traceability to another suitable reference, such as certified reference materials supplied by a competent producer, or the results of reference measurement procedures, of specified methods, or of consensus standards, all clearly described, accepted as fit for their purpose and backed by suitable comparison.
The graph holds this control, the 1 it maps to, and the evidence behind each claim, over MCP and REST.