Instant Ocean Reef Master Test Kit (includes tests for pH, alkalinity, Nitrate, phosphate & calcium) The Reef Master Test Kit includes tests for pH, alkalinity, nitrate, phosphate, and calcium One-piece color chip comparator is easier to use than any other saltwater test kit available Durable wide-mouth holder has more room for adding the test chemicals and is more stable to prevent spilling Foil packets protect the granular test chemicals from light and moisture, and keep them fresh indefinitely