API Reef Master Test Kit ^402MAPI Reef Master Test Kit ^402M To maintain and grow healthy corals, the correct balance of calcium and carbonates is essential, as are low levels of phosphate and nitrate. This kit provides highly accurate testing for each of these critical parameters. Unique, transparent dome allows clear view of kit contents Kit includes computer calibrated and laminated colour cards, 4 test tubes and holding tray. Also contains complete, step by step instruction