2.1. This Recommendation applies to standard solutions, reproducing the conductivity of electrolytes over the range from 30 S/m to 1 ? 10 – 3 S/m. 2.2. The Recommendation fixes the values for the conductivity of primary standard solutions at 0 °C, 18 °C and 25 °C (Table 1) and for the conductivity of secondary standard solutions at 25 °C (Table 2). 23. Standard solutions reproducing the conductivity are intended for the calibration of conductance cells.