U.S. Air Force Staff Sgt. Joseph Gerdes, 20th Component Maintenance Squadron precision measurement equipment laboratory craftsman, compares the readings of two gauges at Shaw Air Force Base, S.C., Dec. 22, 2016. PMEL Airmen use gauges from their shop to test other equipment for accuracy. (U.S. Air Force photo by Airman 1st Class Destinee Sweeney)
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