Pet API Saltwater Master Test Kit, Includes laminated color card, 4 test tubes and holding tray Supply Store/Shop A complete kit for testing saltwater & reef aquariums. Test include:high range pH, ammonia,nitrite,nitrate,4 test tubes, tray & rack. Tests water 4 ways to protect marine fish from dangerous water conditions. Over 550 tests. Kit includes instruction booklet on how to correct unsafe water conditions.