Paragon Scientific’s ISO 17025 & ISO 17034 Base Number (BN) Standards are specifically manufactured for the verification of analytical instruments used to determine base number by potentiometric titration. Each standard is certified in strict accordance with international test method protocols, ASTM D2896 / IP 276. Manufacture and certification is carried out in strict accordance with Paragon Scientific’s dual UKAS accreditations to ISO 17025 & ISO 17034. This dual accreditation allows us to ensure the highest level of accreditation guarantee and provides the most credible certified data available worldwide.