Hi, First post on here, I am very familiar with GRR & MSA studies. My question relates to measurement system validation. I am very familiar with IQ/OQ/PQ as they relate to automated measurement and more complex measurement systems that have risks (method bias and linearity changes, used for process control instead of release testing, etc.) and need scrutiny, my question is about hand tools. The risk needs to be evaluated, but once the risk is looked at, if a GRR seems sufficient (no significant bias, linearity, environmental, other concerns, etc.) with risk controls, how do you justify this? In your experience, do you validate (maybe just a simple IQ no OQ) hand tools such as calipers, height gages, micrometers, etc. and NA most of your standard paperwork? If not how do you justify not validating them if they are used to release product and just run a TMV, MSA, GRR? Do you use a reference standard (ASME, ANSI, etc.) to justify use without equipment validation (formal IQ, OQ, PQ)? We have STPs/SOPs on how to run specific tests with these tools (Few ISO 17025 or ASQ accredited QC technicians however), calibration systems in place, but I am wondering as we update paperwork and standard instructions, calibration instructions, if we need to go back and run simple IQs or if in your experience you use other standards to point to? Granted, I am trying to get out of this...but when the risk is low enough (big tolerances in comparison to accuracy, acceptance testing with no process control feedback, etc.) how do you look at this or justify no formal equipment validation? Thanks for your help on this one and sorry for the runon, just want to show I have actually put some thought into this.