Repeatability

Reproducibility

      Gage A              Gage B

Appraiser 1    Appraiser 2    Appraiser 3

To determine which gage is more repeatable, Appraiser 1 measures a single part with Gage A 20 times, then measures the same part with Gage B 20 times.

Gage A has less variation, so it is more repeatable than Gage B.

To assess gage reproducibility, Appraisers 1, 2, and 3 measure the same part 20 times with the same gage.

The variation in average measurements between Appraisers 1 and 2 is much less than variation between Appraisers 1 and 3. Therefore, your gage demonstrates poor reproducibility.