Senior Airman Jacob Gagnon, 56th CMS PMEL journeyman, checks the parallelism of an angle plate using a height gauge Nov. 17 in Bldg. 417 at Luke Air Force Base. The surface Gagnon is working on is called a granite surface plate and is calibrated to an accuracy of 500 micro inches. (U.S. Air Force photo/Senior Airman Grace Lee)
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