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Ditch the test strips and start using reliable aquarium testing equipment

Test saltwater parameters such as magnesium, alkalinity, calcium, and more with our convenient Marine Checkers. Stop guessing results by eye, get instant digital readings.

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HI713 Low Range Phosphate Colorimeter - Checker® HC $74.99
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HI781 Marine Nitrate Low Range Checker® HC $74.99
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HI782 Marine Nitrate High Range Checker HC $74.99
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HI774 Marine Phosphate Ultra Low Range Colorimeter - Checker® HC $74.99
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HI772 Saltwater Aquarium Alkalinity Colorimeter (dKH) Checker® HC $74.99
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HI758 Saltwater Aquarium Calcium Colorimeter - Checker® HC $74.99