Keep your fish tank clean and healthy with the Test 6 in 1 from Tetra. This simple tester kit will ensure that your water is safe for your fish to live in. The kit will test for pH (6.4 to 8.4), GH (general hardness), KH (carbonate Hardness), Nitrite (NO2) and Nitrate (NO3). It is simple to use and will provide your fish with the healthy environment they require. The Tetra Aquarium 6 in 1 Test Strip kit is a popular product for your aquarium testing needs. Dip test for checking 6 water quality indicators in just 60 seconds. Tests for pH, Nitrite, Nitrate, KH (carbonate hardness), GH (general hardness), and chlorine Application : Simply dip the test strip in the water for a few seconds, and then wait a minute for it to change colour. Then just compare the colours to the chart on the pack to get your readings. Always read the instructions before use. We recommend testing every 2-3 days in new aquariums, and once a week in established aquariums. The Tetra Water Care App for Smart Phones and Tablets is a highly useful and easy app which allows you to quickly enter the results from your Tetra test kit. The app will immediately be able to give you a treatment plan tailored to your tank size, and can also allow you to set reminders for when a water test is due. Another useful feature with this app is the useful tests log which keeps track of all of your tests, so you can easily look back on your water levels over time. Fish react very sensitively to excessive changes in the pH value, which impacts their well-being. The general hardness affects the vital functions of fish, while the carbonate hardness has a direct influence on the stability of the pH value (pH buffer). Nitrite is extremely harmful, even in very low concentrations, and should not be detectable in the water.Tetra 6 in 1 test strips enable you to quickly and reliably determine the six most important water values in your aquarium in just 60 seconds. The pH, carbonate hardness (KH), general hardness (GH), nitrite (NO2-), nitrate (NO3-) and chlorine (Cl2) in the aquarium water are measured, and the colour chart can be used to determine whether these are within the safe range.