Exaxol Total Hardness Standard, 1,000ppm

Total Hardness Standard 1,000 ppm by Exaxol, catalog numbers T70421-500 and T70421-1, is an aqueous total hardness standard at 1,000 ppm (see certificate for expression, typically as CaCO₃), used to prepare calibration and check standards. Available in 500 mL and 1 L from MBP, a registered vendor to many research institutes across the USA.