Do all RMP’s accredited with ISO Guide 34 have to work within the same uncertainty estimations as each other and if so are the tolerances stipulated within ISO Guide 34?
No, they do not and this is not a part of ISO Guide 34. There is no multi-lateral agreement (MLA) in place for ISO Guide 34 yet which means that different accreditation bodies are allowing different schedules of accreditation. Some of these schedules contain very little information on best measurement capability. In ISO 17025 the schedules follow a more standardised format so the user can make comparison of different products before buying. In addition CRM’s have to be approved before coming to market. Under ISO Guide 34, RMP’s can self-certify so it is possible that sub-standard products could be released on to the market. The uncertainty calculation is stated on the certificate but by the time you have read the certificate you have probably bought the product.
