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Replacement alkalinity reagent for compatible Hanna HI755 and HI772 marine alkalinity Checkers. Provides up to 25 tests when used as directed. Reagent refill only; Checker sold separately. Confirm compatibility with your instrument before purchase.
Replacement reagents for the Hanna HI774 Marine Phosphate Ultra Low Range Checker. Includes reagents for 25 tests. Refill only; HI774 Checker sold separately. Select the reagent that matches your exact Checker model.
Replacement reagents for the Hanna HI782 Marine Nitrate High Range Checker. Includes reagents for 25 tests. Refill only; Checker sold separately. Designed specifically for HI782 testing, not the HI781 low-range model.
Measure calcium in your saltwater aquarium with a manual color-change test. Useful for monitoring this important reef parameter and making informed dosing and water-change decisions. Follow the included instructions.
Monitor carbonate hardness and alkalinity in your marine or reef aquarium with this manual test kit. A practical choice for tracking changes and guiding routine reef maintenance. Follow the included instructions for your kit version.
Check magnesium levels in your marine or reef aquarium with this manual test kit. Regular testing helps you track magnesium alongside calcium and alkalinity. Use the instructions supplied with your specific kit.
Monitor nitrate in your saltwater aquarium with a manual color-comparison test. A useful tool for tracking nutrient trends and evaluating changes to feeding, filtration and maintenance. Follow the included instructions.
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