1. 50 titration tests for strontium 2. Only 10 minutes per test! 3. Precise results in 0.5 mg/L increments 4. Easy test validation with included reference FEATURE: Strontium occurs in natural seawater at a concentration of about 8 to 10 mg/L. It is chemically very similar to calcium, and many organisms incorporate it in their skeletons along with calcium. Its addition to reef aquariums aids the growth of corals, coralline algae and other organisms that lay down a calcereous skeleton or shell, including tridacnid clams. www.xinyangaquarium.com