Re: MSA - Instrument Selection
This depends on the context in which your organization operates. The QMS standard or specific customer requirements to which you adhere may require this, and many do require it. For example, the automotive industry would require that any measurement device on your control plan have an MSA.
If you are operating completely free of such requirements, you might take a risk based approach, weighing the importance and criticality of the measurements taken with these instruments.
If you provide more context, we can be more specific.