Environmental Express Conductivity and TDS Standards are manufactured under ISO 9000 quality guidelines and traceable to NIST standard reference materials. KCl, NaCl and 442 conversions printed on the bottle (60-mL bottle, included on insert). Standard values are corelated at 25°C. Conductivity options available from 1 µS/cm to 200,000 µS/cm for a variety of applications, including environmental monitoring, pharmaceutical and biotech, food and beverage manufacturing, and corrosion testing.

If unopened, shelf life is 1 year. Opened recommended shelf life is 4 months.