This is the test kit we routinely turn backyard aquaponics and aquaculture growers to. It is highly affordable, extremely accurate and good for over 800 tests. Includes all tests required to test the nitrogen cycle. This kit tests the water for five different parameters that affect the health of freshwater fish: pH, High Range pH, Ammonia, Nitrite and Nitrate. Highly accurate and economical. Kit includes computer-calibrated and laminated color cards, 4 glass test tubes and holding tray. Also contains complete, step-by-step instruction booklet, including information on how to correct unsafe water conditions. Compact and easy to store. Over 800 tests per kit.