Maintaining good water quality is the key to successful fishkeeping. The API Reef Master Test Kit is a complete kit for testing saltwater aquariums to protect marine fish. Coral and invertebrates from unsafe water conditions. The REEF MASTER TEST KIT tests 4 key parameters to keep reef inhabitants healthy. The kit is highly accurate and economical, and includes 7 bottles of liquid test reagent,2 computer-calibrated, laminated color cards,4 glass test tubes with snap-tight caps, holding tray, as well as complete, step-by-step instruction booklet, including information on how to correct unsafe water conditions