Hach conductivity standards are available in a variety of packaging sizes - from bulk 20 L containers down to single-use 20-mL Singlets for on-site analyis. Singlets assure freshness and eliminate the possibility of contamination. All standards are NIST traceable.
For applications where accuracy is critical, Radiometer brand IUPAC standards are also available. Each IUPAC standard is supplied with a Certificate of Conformity and Traceability.