The JBL ProAquaTest CombiSet Plus Fe Water Test Kit is perfect for planted or aquascaped aquariums. Regular water testing is key to maintaining a healthy aquarium with conditions as close to the natural environment as possible. The JBL CombiSet Water Test Kit Plus Iron provides a full testing lab for 5 of the most important water parameters. The CombiSet Plus Fe includes testing for acidity (pH), nitrite (NO2), nitrate (NO3), iron (Fe) and carbonate hardness (KH). The CO2 level may also be determined by measuring the pH and KH values and using the enclosed reference table. JBL CombiSet Plus Fe Water Test Kit Contents: 1 x plastic case, incl. 7 reagents, 3 glass vials with screw caps, 1 plastic vial, syringe, dosing spoon, comparator block, colour charts, analysis record sheets and instructions. Precise Measurement of the Following Values: pH Test - Acidity of the water from 3.0 to 10.0 KH Test - Stability of the water / carbonate hardness NO2 Test - Toxic Nitrite level NO3 Test - Nitrate level which causes algae Fe test: Determination of the iron content to monitor the fertilisation CO2 Test: carbon dioxide levels using reference table You can analyse your measured water values in the JBL Online Laboratory free of charge and receive recommendations.