Replacement reagents for the Hanna Marine Alkalinity (dKH) Checker HC, HI772. Each pack has enough for 25 tests, so you can keep testing alkalinity in your reef tank without replacing the Checker.
The reagents use a colorimetric method. Added to a water sample, they turn it from yellow through green to blue depending on the alkalinity, and the Checker reads the colour and shows the result in dKH. They are made for samples between 0.0 and 20.0 dKH, which covers normal reef levels.
The reagents are marked with their lot number and expiry date. To check the Checker itself, use the HI772-11 calibration check set. If your Checker shows ppm rather than dKH, it is the HI755: use the HI755-26 reagents instead.
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