Elos has a wide range of test kits available to help any reef aquarist maintain proper levels. Bulk Reef Supply carries Elos Test Kits for Alkalinity, Ammonia, Calcium, Magnesium, Nitrate, Nitrite, pH Marine and Phosphate. Each test provides precise testing and low risk reagents. Product validated using NIST samples and independent seawater lab. RealColor technology used to calibrate color chart for accuracy.