This 1,413 µS/cm conductivity standard is prepared against a NIST traceable potassium chloride solution. The solution has the lot number and expiration date clearly marked on the label and has an air tight, tamper-proof seal. Hanna's line of standards expire 5 years from the date of manufacture for an unopened bottle.

This 1,413 µS/cm conductivity standard is prepared against a NIST traceable potassium chloride solution. The solution has the lot number and expiration date clearly marked on the label and has an air tight, tamper-proof seal. Hanna's line of standards expire 5 years from the date of manufacture for an unopened bottle.