"• Single-parameter colorimeter for quick and accurate measurements • US EPA-approved DPD method• Large, easy-to-read backlit LCD• Durable, IP68-rated waterproof housing • Convenient data storage with GLP time-and-date stamp The YSI 900 rugged, waterproof chlorine colorimeter is ideal for laboratory, field, and plant measurements. Innovative light shield is designed to avoid breakage or loss. The meter features a large, backlit display, a real-time clock, and automatic data logging for 16 data sets. User calibration is available to any government or organizational standards (NIST, ISO, or DIN)."

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