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ANS dkH4 Reference Solution allows us to measure co2 in your drop checker accurately. Many drop checker instruction inform us to use tank water. However, it is commonly known that these water sources will have different dKH level. This will make color comparison of the drop checker useless.
Having a reference solution allows color reference to be standardize and making it more accurate.


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For more information please refer to this link below

http://www.eastoceansg.com/ans-dkh4-...ml-p-1430.html