6. Demonstration of MR traceability during an audit

Depending on the type of material, demonstrating traceability is more or less straightforward.

If the MR "producer" is an internationally recognized institute (IRMM, FAO, IPPC, National Metrology Institutes, etc.), the material is accompanied by a certificate specifying the reference value, its associated uncertainty and, where relevant, a unit.

Otherwise, it is advisable to specify the acknowledgements expected from the supplier and the minimum content of the document issued.

The user must choose the reference material taking into account :

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