This Kit tests tap water and aquarium water for five different parameters that affect the health of freshwater fish: pH, High Range pH, Ammonia, Nitrite and Nitrate. Highly Accurate and economical. * Unique, transparent dome allows clear view of kit contents * Includes all tests required to test the nitrogen cycle * Kit includes computer-calibrated and laminated colour cards, 4 test tubes and holding tray * Also contains complete, step-by-step instruction booklet, including information on how to correct unsafe water conditions * Compact to merchandise and easy to store at home Approximately Over 800 Tests. 7 Bottle Kit.