Simply add reagent turn the wheel until the sample matches a reference color and concentration is displayed in a window each hach color disc test kit includes apparatus reagents and instructions all in a rugged carrying case. This color disc test kit uses powder dpd reagent that reacts with chlorine more quickly than tablet form dpd giving more accurate results powder dpd also has a considerable advantage over orthotolidine a hazardous substance sometimes used as a free and total chlorine test reagent. Hach chlorine free total color disc test kit model cn 66 0 to 35 mg l cl2. Hachs unique color disc kits feature a continuous gradient color wheel for fast accurate comparisons the continuous color provides higher levels of accuracy kits also use a blank as a reference in color comparison compensating for color in the sample. Simply add reagents to the sample turn the wheel until the sample matches a reference colour concentration is displayed in a window each hach colour disc test kit includes apparatus reagents and instructions all in a rugged carrying case
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