Reagent set for the determination of Calcium Hardness by EDTA Digital Titrator Titration Method (Hach method 8204). Range: 10-160 mg/L as CaCO3. Set contains CalVer® 2 Calcium Indicator Powder Pillows, Potassium Hydroxide Solution (8 N) and 0.0800 M (EDTA) Digital Titrator Cartridge for approximately 40-100 tests.