Exaxol Calcium Carbonate Standard, (1mL=1mg CaCO3=0.4mg Ca, 1000ppm), for Hardness

Calcium Carbonate Standard 1,000 ppm for Hardness by Exaxol, catalog numbers C1010-100, C1010-500, and C1010-1, is an aqueous calcium standard at 1,000 ppm (1 mL = 1 mg CaCO₃ = 0.4 mg Ca), used to prepare calibration and check standards. Available in 100 mL, 500 mL, and 1 L from MBP, a registered vendor to many research institutes across the USA.