Staff Sgt. Christian Hubbard, 57th Maintenance Squadron Precision Measurement Equipment Laboratory craftsman, calibrates a low-frequency signal generator at the PMEL Oct. 28, 2013, at Nellis Air Force Base, Nev. The low-frequency signal generator is used to test various pieces of electronic equipment for its range. (U.S. Air Force photo by Airman 1st Class Thomas Spangler)
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