Enviro-Equipment 100 µS/cm Conductivity Solution 100 µS/cm conductivity solution for calibrating water quality instruments. SKU 100COND-250ML $12.99 Select product 100 µS/cm Conductivity Calibration Solution, 250 mL100 µS/cm Conductivity Calibration Solution, 500 mL100 µS/cm Conductivity Calibration Solution, 1 L Quantity