Test strips measure the amount of free chlorine from 0-750ppm 0, 25, 50, 100, 200, 300, 400, 500, and 750 ppm (mg/L) detection levels 31 second test time Resists interference from monochloramines Bottle of 50 test strips test strips measure the amount of free chlorine from 0-750ppm 0, 25, 50, 100, 200, 300, 400, 500, and 750 ppm (mg/l) detection levels 31 second test time resists interference from monochloramines bottle of 50 test strips ; Included components: Bottle of 50 test strips; Unit count: 50.0
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