FRESHWATER MASTER TEST KIT Measures the most important aquarium levels quickly and accurately Benefits: Tests pH, High Range pH, Ammonia, Nitrite & Nitrate Scientifically accurate for professional results Follow API Easy Care Guide and use the FRESHWATER MASTER TEST KIT: During Regular Care When addressing Water Problem Solving issues Taking a few minutes each week to maintain and monitor aquarium conditions is the key to a healthy aquarium. The FRESHWATER MASTER TEST KIT tests the parameters that affect the health of freshwater fish: pH, High Range pH, Ammonia, Nitrite and Nitrate.