Hanna Instruments Checker® HC colorimeter for total chlorine: accurate digital readout, no more subjectivity from color-matching test kits.
The Hanna Instruments HI711 Checker® HC is a pocket-sized colorimeter that measures total chlorine with a digital readout, instead of matching colors by eye against a chart.
Total chlorine accounts for both free and combined chlorine, the disinfectant used in municipal water, food and beverage equipment sanitation, and produce wash water. Reading it against a color chart is subjective; the Checker® HC removes that subjectivity with a single button press.
The instrument uses an adaptation of the USEPA DPD method (330.5): an LED light source at 525 nm passes through the sample and a silicon photocell measures the color change, converting it into a precise ppm reading.
Includes two sample cuvettes with caps, a total chlorine reagent starter kit, battery, and instructions.