Senior Airman Daniel Lemier, 57th Maintenance Squadron Precision Measurement Equipment Laboratory journeyman, cleans a gauge block at the PMEL Oct. 28, 2013, at Nellis Air Force Base, Nev. If the gauge blocks are not regularly and thoroughly cleaned, residue will build up resulting in the blocks providing an inaccurate measurement when determining wiring length. (U.S. Air Force photo by Airman 1st Class Thomas Spangler)
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