J

The point of the test is to measure a charactersitic on a device that we suspect may be varying.

Tradional suggestions may be to to use a subgroup and approximate the tradional Gauge R&R method by assuming by making a subgroup of parts identically.

However the whole point of the test is to determine whether the characteristic is consistent from device, and the process may not be capable of making an identical devices in a so this would defeat the purpose.

How would you do Gauge R&R or test validation on this test?