Clarity of vision at 20 inches or less, three-dimensional vision, ability to identify and distinguish colors, and ability to adjust the eye to bring an object into sharp focus to review test results, perform testing of CSTRS, install strain gage, view PC screen, read technical manuals, calibration of machines and equipment, adjust equipment, use measuring devices, microscopes, etc. Occasionally works outdoors, has to wear a respirator, works with toxic or caustic chemicals, works in non-weather humid conditions, or works near moving mechanical parts.