Airman 1st Class Chris Wahrmund, 57th Maintenance Squadron Precision Measurement Equipment Laboratory apprentice, calibrates a pressure-temperature test set at the PMEL Oct. 28, 2013, at Nellis Air Force Base, Nev. A pressure-temperature test set is used to test aircraft cockpit panels by simulating in-flight pressure conditions. (U.S. Air Force photo by Airman 1st Class Thomas Spangler)
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