Proficiency Test Reference Lab:

Mitutoyo America Corporation, Elk Grove Villiage, IL establishes the artifact reference value of for the micrometers used in the proficiency test, Micrometers #1.

This A2LA accredited calibration laboratory has a proven record of performance, and delivers measurement uncertainty of 100 microinches for the 0.001" resolution micrometer and 50 microinches for the 0.0001" and 0.00005" resolution micrometer.