Detecting the concentration of residual chlorine in sodium hypochlorite solution (NaClO) or hypochlorous acid (HClO). Dip the indicator test strip in solution and compare to the color chart on the container.
1-10ppm is a 5x85mm plastic strip with indicator pad (50/pk); 10-50ppm and 25-200ppm are 7x40mm paper strips (300/pk).
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