Pet API Freshwater Master Test Kit, includes laminated color card, 4 test tubes and holding tray Supply Store/Shop Freshwater Master Test Kit is a complete kit for testing aquarium water. Tests water 6 different ways to protect tropical fish from dangerous water conditions. Tests include: freshwater pH, ammonia, nitrite, high range pH, and nitrate, 4 test tubes, tray. Includes instruction booklet on how to correct unsafe water conditions. Kit includes laminated color card, 4 test tubes and holding tray.