Precision matters
U.S. Air Force Airman 1st Class Sarah Cartmill spins the pressure controller on an electronic deadweight tester in the precision measurement equipment laboratory on Seymour Johnson Air Force Base, N.C., March 28, 2012. The tester calibrates hydraulic gauges and Airmen inspect it every six months for quality assurance. Cartmill, 4th Component Maintenance Squadron test measurement diagnostic equipment technician, hails from Millry, Ala. (U.S. Air Force photo/Airman 1st Class John Nieves Camacho/Released)
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