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U.S. Air Force Airman 1st Class Kristopher Richardson, 52nd Aerospace Medicine Squadron Bioenvironmental Engineering technician, uses a phenol red solution to determine pH level of tap water at Spangdahlem Air Base, Germany, January 7, 2020. A perfect pH level is 7.0 however some minor variance is allowed. A proper pH is important to prevent the water from being dirty or corrosive. (U.S. Air Force photo by Senior Airman Kyle Cope)
CAMERA
NIKON D5
LENS
24.0-70.0 mm f/2.8
APERTURE
63/10
SHUTTERSPEED
1/100
ISO
400
No camera details available.
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