Mardel® Master Test Kit reads the pH, Hardness, Alkalinity (Buffering Capacity), Nitrite, Nitrate and Ammonia levels in both fresh or saltwater aquariums. Mardel test strips use the same technology found in medical laboratories and replace other potentially toxic and time consuming kits. They are designed to be accurate and dependable while being safe and easy-to-use. Contains 50 test strips (25 Ammonia and 25 Five in One), test tube and water quality guide. Shipping weight: 1/4 lb.