Supplementary to ISO 9001 standard, if a company needs to further improve their system of measurement, they can use the ISO 10012 titled "Measurement management systems- Requirements for measurement processes and measuring equipment."
On the standard's Clause 6.4 Outside Supplier, under "Guidance", the standard states that, .......................
This is what the Scope of ISO 10012 say:
............... This International Standard is not intended to be used as a requisite for demonstrating conformance with ISO 9001, ISO 14001 or any other standard. .....................
This is a guidance document talking about Measurement Management System.