This master kit tests tap water and aquarium water for 5 key parameters that affect the health of freshwater fish: pH, High Range pH, Ammonia, Nitrite and Nitrate. Highly accurate and economical. 5 Liquid tests include: pH(6.0 – 7.6) and (7.4 – 8.8), Ammonia, Nitrite and Nitrate Each test includes laminated, computer-calibrated colour cards. Liquid reagent bottles include child-resistant safety caps. Includes 4 glass test tubes with snap tight caps and easy to read instructions with information on how to correct unsafe water conditions.