KCl_1D 111.3 mS/cm ±0.5% at 25°C KCl_0.1D 12.85 mS/cm ±0.5% at 25°C KCl_0.01D 1408 µS/cm ±0.5% at 25°C NACl_0.05% 1015 µS/cm ±0.5% at 25°C Standard solution traceable to Standard Reference Material produced by NIST (USA). Delivered with a Certificate of Conformity and Traceability drawn up following ISO Guide 31 and DKD calibration certificate. Tolerance specified using (k=2) as expanded uncertainty. Easy to follow GLP: - Opening date and number of uses can be marked directly on the bottle - Batch No. is printed on can, bottle and certificates.