Master Sgt. Michael Sumich, 562nd Combat Sustainment Group, oversees Michael Warring’s calibration of a digital vacuum transducer as part of Dover Air Force Base’s precision measurement equipment laboratory biannual evaluation and certification. Most PMEL facilities are audited every two years to ensure their measurements and calibrations practices are ‘in tolerance.’ (U.S. Air Force photo/Tech. Sgt. Kevin Wallace)
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