Conductivity standards are used to calibrate conductivity meters and K=10 cell constant conducutivity probes to assure more accurate readings.

This is a 16 oz. bottle of potassium chloride (KCl) measured to very high accuracy per ASTM standard D1125-77. A precisely weighted amount of thoroughly dry KCl is specified to be dissolved in an exact volume in a volumetric flask. The normality of the resulting solution is close to, 111,342 uS/cm @ 25 Celsius.