Labtron Portable Colorimeter measures 0 to 500 PCU using platinum-cobalt colorimetry with 0.01 PCU resolution and -0.3 to 3 A absorbance range for water color analysis. Built-in standard and user-defined calibration curves with 5000-set data storage support laboratory testing workflows. An IP54 enclosure, silicon photodiode detector, and 10-hour rechargeable battery enable field and environmental water quality testing.