One-step water test to measure seven important water values to ensure aquarium water is safe and healthy. Measures the pH, general and carbonate hardness (GH + KH), nitrite (NO2-), nitrate (NO3-), chlorine (Cl2) and carbon dioxide (CO2) Regulary monitor water values as an early warning system to detect poor water quality Full information and tips on possible solutions can be found in the instructions for use
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