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SPEX CertiPrep is a leading manufacturer of certified reference materials (CRMs) and calibration standards for analytical spectroscopy and chromatography. We offer a full range of inorganic and organic CRMs. We are certified by UL-DQS for ISO 9001:2008 and are proud to be accredited by A2LA under ISO 17025:2005 and ISO Guide 34-2009. The scope of our accreditation is the most comprehensive in the industry and encompasses all our manufactured products.