The compact measuring cells for determining the specific conductivity are based on the two-electrode principle. The measuring range of the cells depends on the materials used and the cell constant K. The measuring cells can be fitted with temperature sensors (Pt 100) as an option, to compensate the influence of the medium temperature. The conductivity measuring cells with cell constants K = 0.01 and 0.1 1/cm have been specially designed for measurements in high-purity and pure water applications. Typical applications for these measuring cells are: nitoring ion exchangers specting reverse osmosis. Measuring cells with cell constant K = 1.0 1/cm are used in industrial process water applications.