An accurate and economical liquid test kit.Tests for 4 key parameters in reef aquariums: Calcium Carbonate Hardness (KH) Phosphate and Nitrate. Unique clear dome packaging is waterproof space-efficient and makes contents easy to see.Includes laminated computer-calibrated colour card 4 glass test tubes with snap-tight caps and easy-to-read instructions with information on how to correct unsafe water conditions. Liquid reagent bottles include child-resistant safety caps.