The JBL ProAquaTest Lab provides simple yet reliable monitoring of water values in aquariums. The ProAquaTest Lab tests for the the most important water parameters including pH (3 ranges), carbonate hardness, general hardness, ammonium/ammonia, nitrite, nitrate, phosphate, iron, copper, silicate, oxygen, and, with the help of a table, CO2. The right water values depend on the fish stock and the plants in the aquarium. Even if the water looks clear it can be contaminated. Bad values can cause diseases or algae in the aquarium. To maintain a healthy aquarium with conditions close to nature it is important to check and adapt the water values regularly. With JBL water tests you can determine all the relevant water values quickly, easily and very precisely. JBL ProAquaTest Lab Contents: plastic carry case, incl. 13 tests, 12 glass vials, 2 syringes, 3 measuring spoons, thermometer, comparator block, 2 plastic cuvettes, colour charts, CO2 table, pen, report sheets and operating instructions. Precise measurement of the following values: pH test: Water acidity from 3.0 to 10 pH test: Water acidity from 6.0 to 7.6 pH test: Water acidity from 7.4 to 9.0 O2 test: Determines the oxygen content CO2 test: Determines the carbon dioxide content for thriving plant growth GH test: Determines the general hardness KH test: pH stability of the water (carbonate hardness) PO4 test: Determines the phosphate content (reason for algae growth and plant nutrient) Test NH4 / NH3: Identifies non-toxic ammonium, uses table to determine any toxic ammonia NO2 test: Determines nitrogen compound nitrite, which is toxic for the fish NO3 test: Determines the nitrate content (reason for algae growth and plant nutrient) Fe test: Determines the iron content to monitor fertilisation K test: Determines the plant nutrient potassium Cu test: Determines heavy metal deadly for invertebrates. Also important for adjusting the dose of therapeutic medications SiO2 test: Determines the silicates (silicic acid), which cause diatoms To determine the CO2 content, you just need to measure the pH and KH values. These two values will give you the CO2 content in the water, which then can be referenced from the enclosed table.