The 12880 µS/cm (12,88 mS/cm) calibration solution is widely used ti assure the proper performance of conductivity meters with a scale higher than 10 mS/cm.
This solution is used mainly for industrial applications.
The 1413 µS/cm solution is the one best suited for general use.
By using our single-dose 20 ml sachets, the freshness of the solution is guaranteed for every calibration.