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BODC-annotated reference material classifiers

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ID Preferred Label Definition Date
CRM Certified Reference Material A Reference Material, accompanied by a certificate, one or more of whose property values are certified by a procedure which establishes its traceability to an accurate realisation of the unit in which the property values are expressed and for which each certified value is accompanied by an uncertainty at a stated level of confidence. The certification is issued by an organisation generally accepted to be technically competent in the appropriate discipline. 2014-03-26
LRM Laboratory Reference Material A material developed by a laboratory for its own internal quality assurance use. The material is not certified by an external source. 2014-03-26