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Reference materials Material, sufficiently homogeneous and stable with respect to one or more specified properties, which has been established to be fit for its intended use in a measurement process.

Certified Reference Materials (CRMs) Reference material characterized by a metrologically valid procedure for one or more specified properties, accompanied by a certificate that provides the value of the specified property, its associated uncertainty, and a statement of metrological traceability.

Bhartiya Nirdeshak Dravyas (BNDTM) A CRM developed by CSIR-NPL having metrological traceability for one or more specified properties with associated uncertainty accompanied by a certificate of analysis. The term “Bhartiya Nirdeshak Dravyas (BNDTM)” is registered with Registrar of Trademark office, India.