API Saltwater Master Test Kit ^401MAPI Saltwater Master Test Kit ^401M Providing for the needs of marine aquarists, this kit contains testing materials for four key parameters that effect the health of saltwater fish: High Range pH, Ammonia, Nitrite & Nitrate. Highly accurate and economical. Unique, transparent dome allows clear view of kit contents. Includes all test required to test the nitrogen cycle. Kit includes computer calibrated and laminated colour cards, 4 test tubes and