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Tech. Sgt. Michael, left, and Airman 1st Class Britain, heating, ventilation and air conditioning technicians assigned to the 380th Expeditionary Civil Engineering Squadron, troubleshoot repairs to an air-conditioning system with a voltmeter at undisclosed location in Southwest Asia, March 2, 2016. A voltmeter, also known as a voltage meter, is an instrument used to measure the difference in voltage between two points in an electronic circuit and can diagnose various problems. (U.S. Air Force photo by Staff Sgt. Kentavist P. Brackin/released)
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