Tech. Sgt. James Warren, 436th Operational Medical Readiness Squadron bioenvironmental engineering flight noncommissioned officer in charge, tests non-potable water for pH and chlorine levels March 18, 2020, at the main gate on Dover Air Force Base, Delaware. Warren used a Hach DR900 Colorimeter to perform the two tests on the water used by 436th Operational Medical Readiness Squadron personnel to wash their hands. (U.S. Air Force photo by Roland Balik)
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