This reference material (CRM) is directly traceable to the corresponding primary reference material from the Physikalisch Technische Bundesanstalt (PTB), Germany.

Please visit ISO certificates and Site Quality Self-Assessments to access the current certificates of accreditation.

Download your certificate at https://www.sigmaaldrich.com/US/en/documents-search to view certified values, including uncertainty and expiry date.

Conductivity calibration standard to measure electrolytic conductivity in aqueous solution.

Electrical conductivity (25 °C): 0.143 - 0.151 mS/cm

For a complete product listing of our ICP and AAS range, including technical information and example certificates, please visit ICP & AAS standards website

For detailed information for our newly launched Conductivity Standards check the flyer: Commitment to Quality: Elevating Certipur^® Standards to Certified Reference Material

In our effort to be more sustainable, we′re going digital with COAs-download them directly from our website.

CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany