API\'sFRESHWATER MASTER TEST KITmeasures the most important aquarium levels quickly and accurately. It is scientifically accurate and provides professional results, testing for pH, Ammonia, Nitrite and Nitrate. These are all importantparameters that affect the health of freshwater fish The test kit has an easy-to-use guide, and can be used both during regular care and when addressing specific water problems. It is recommended to dedicated a few minutes each week to maintain and monitor aquarium conditions is the key to a healthy aquarium. The FRESHWATER MASTER TEST KIT is highly accurate and economical and includes a computer calibrated laminated colour card 4 test tubes and holding tray. The FRESHWATER MASTER TEST KIT comes with a complete step-by-step instruction booklet including information on how to correct unsafe water conditions.