NELLIS AIR FORCE BASE, Nev. -- Senior Airman Mathew Harrington, a Precision Measurement Equipment Laboratory journeyman assigned to the 57th Maintenance Squadron, conducts maintenance on a 53 plug-in unit, which is used to calibrate an oscilloscope April 5. An oscilloscope is a electronic instrument used for measuring electronic sound waves. (U.S. Air Force photo by Senior Airman Michael Charles)
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