PMEL: only the most precise will suffice
Airman First Class Adam Suddeth, 437th Maintenance Squadron Precision Measurement Laboratory calibration technician, cleans off weights used to calibrate measurement systems at Joint Base Charleston, S.C. July 18, 2017. Technicians calibrate, align, troubleshoot and repair test equipment and tools used at 11 Department of Defense installations.

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Photo by: Airman Joshua R. Maund |  VIRIN: 170718-F-SU156-0088.JPG