Our favorite all-around test kits are the red sea kits. With easy to follow directions, and consistent results, we always have a Red Sea Reef Foundation test kit in our testing closet. The Red Sea multi-test kits are by far the best value for purchasing multiple test kits. Amazing Value. High quality and reliability. Monitor the balance of Calcium, Alkalinity, and Magnesium in your reef tank\’s foundation with this all-in-one test kit from Red Sea. Kit includes: 75 Calcium test kits 75 Alkalinity test kits 75 Magnesium test kits Analytical grade glass vials Easy-to-use, high precision Titrator Affordable reagent refills RED SEA REEF FOUNDATION PRO MULTI TEST KIT CONTENTS Test Name Element # of Tests Accuracy Range Test Type Calcium Ca 75 2.5ppm Titration KH/Alkalinity KH 75 0.025 Titration Magnesium Mg 75 10ppm Titration