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This kit tests 4 key parameters in reef aquariums: Calcium, Carbonate Hardness (KH), Phosphate and Nitrate. Liquid regeant bottles with child-safety caps. Includes 4 glass test tubes with snap tight caps and easy to read instructions with information on how to correct unsafe water conditions. Highly accurate and economical. Unique, clear dome packaging is waterproof, space-efficient and makes contents easy to see.