Aquaponic Test Kit 9 Elements.  The importance of knowing the quality of your water can not be understated. This aquaponic water Test Kit comes with easy to use, step-by-step instructions for Total Ammonia Nitrogen, Nitrite Nitrogen, pH  Alkalinity, Carbon Dioxide, Dissolved Oxygen and Hardness. Also comes with an armored thermometer. (Additional aquaponic test kits are available for Potassium, Iron, Phosphate and others--please inquire.)