Staff Sgt. Carlos Cardoza, 47th Flying Training Wing Precision Measurement Equipment Laboratory physical dimensional supervisor, displays a container used to help calibrate devices that use thermometers called the triple point of water, because water exists in the form of a solid, liquid and gas inside it, at the PMEL shop on Laughlin Air Force Base, Texas, Feb. 26, 2013. PMEL technicians work to ensure that measurement equipment ranging from scales at the base gym to aircraft gauges provide accurate information. (U.S. Air Force photo/Senior Airman Nathan Maysonet)