This product is a certified reference material (CRM) certified to International Standards BS EN ISO / IEC 17025 and ISO 17034 under UKAS accreditation. Please note that the value stated on this page is nominal. All certified values for the current lots of all Paragon CCS Viscosity Standards can be found on the Paragon Scientific webpage.Paragon ISO 17025 / ISO 17034 certified mineral oil rotational viscosity standards are specifically formulated for use with rotational viscometers.