The Tetra Test CO2 is a precise water testing kit specifically designed to measure the carbon dioxide (CO2) levels in aquariums. With a volume of 10 ml per pack and a total of two test units, this set offers a reliable way to monitor water quality in various types of aquariums, including brackish and cold water. The application of the test kit is straightforward, allowing aquarium owners to accurately determine the CO2 levels, which is crucial for the health of the aquarium inhabitants. The product weighs 40 grams and features an appealing blue color scheme that is both functional and aesthetically pleasing. The Tetra Test CO2 is an essential tool for anyone looking to create a healthy and balanced aquarium environment.