Senior Airman Robbie Bonnette, 99th Logistics Readiness Squadron fuel lab technician, zeroes out a refractometer in the fuels management building Nov. 1, 2013, at Nellis Air Force Base, Nev. The refractometer is used to measure fuel system icing inhibitor content in jet fuel and to make sure the scale is correct when calibrating. (U.S. Air Force photo/Senior Airman Brett Clashman)
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