| Hanna Part No: HI-38020-water
Uses the DPD chemical method to measure for Free and Total Chlorine, the colour wheel comparator kit contains everything you need to carry out 100 individual tests for both Free and Total, (200 tests in all).
Colour wheel comparators offer a better accuracy than the more simple colorimetric test kits. The coloured disc is graduated and fits into the hand-held comparator, where it is used to compare against a colour that has developed in the water sample after the reagent has been added.
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