conductivity at 25 °C.............................. ........ uncertainty...................................................... The standard has been measured with an electrode, whose cell constant is approx. 8,9 cm-1, and a temperature sensor. This conductivity standard is traceable to SRM 999a from NIST (KCl). 1399 - 1427 µS/cm < 1% T (°C) 15.................................................................... 20.................................................................... 25.................................................................... 30.................................................................... 35.................................................................... 40.................................................................... k (µS/cm) 1139 1276 1413 1550 1694 1833 • Form: liquid • Solub. in water (20 ºC): miscible Physical