This kit measures inorganic phosphate to less than 0.05 mg/L, producing a unique easy to read yellow-green-blue color range in marine and freshwater. MultiTest Phosphate performs over 75 tests and contains a reference sample for validation.

Hanna Instruments Phosphate LR Reagent, 100 Tests - Reagents for phosphate LR, ascorbic acid method Range: 0.00 to 2.50 mg/L

Hanna Instruments Marine Calcium Checker - Easier to use and more accurate than chemical test kits. Check your saltwater reef aquarium calcium levels with ease.