Aquaforest marine test kits are designed to quickly and accurately measure the concentration of calcium in reef tanks and other marine environments. As corals grow, they intake calcium and carbonate ions and through a biological process forming their hard skeletons. Regular testing of calcium is significant for any saltwater tank, especially in coral reef tanks along with alkalinity and magnesium levels. Specifications: Testing Range - Unlimited Type of Test - Titration Total Number of Tests - 55-65 (depending on reagent volume required per test) What's Included? 1x 3mL Syringe 1x 1mL Syringe 1x Syringe Tip 1x Test Vial 1x Calcium Reference Solution 1x Instruction Card 1x Quality Certificate