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The Fluval A7850 tests water in the following applications:
The Calcium Water Test for Fresh & Saltwater Aquariums is a water test kit for freshwater and saltwater aquariums. This aquarium water test measures calcium levels in your tank, especially those with hard corals. This aquarium calcium test makes sure that calcium resides in your aquarium at an optimal level for the health of your fish.
Calcium Water Test for Fresh & Saltwater Aquariums specifications: