Keywords: 110405-F-UJ018-150 (5598443284).jpg U S Air Force Senior Airman Mathew Harrington a Precision Measurement Equipment Laboratory journeyman assigned to the 57th Maintenance Squadron Nellis Air Force Base Nev conducts maintenance on a 53 plug-in unit which is used to calibrate an oscilloscope April 5 2011 An oscilloscope is a electronic instrument used for measuring electronic sound waves U S Air Force photo by Senior Airman Michael Charles/Released https //www flickr com/photos/39955793 N07/5598443284/ 110405-F-UJ018-150 2011-04-05 09 43 https //www flickr com/people/39955793 N07 U S Department of Defense Current Photos PD-USGov U S Department of Defense Current Photos https //flickr com/photos/39955793 N07/5598443284 2016-09-03 14 52 44 United States Government Work Nellis Air Force Base Military in Nevada United States Department of Defense |