More than 35 years production and distribution of analytical standards, reference materials, environmental standards for residue analysis and environmental analysis.
http://www.analytical-standards.com

LGC Promochem is Europe’s most comprehensive source of reference materials.
http://www.lgcpromochem.com

NIST supplies industry, academia, government, and other users with over 1100 reference materials of the highest quality and metrological value.
http://www.nist.gov

The sole officially recognised Certificated Reference Material produced from Canada.
http://inms-ienm.nrc-cnrc.gc.ca

Providing Certified Reference Materials and QA services for water and sediment trace elements.
http://www.ec.gc.ca/inre-nwri/

A solution provider for mycotoxin detection, products include mycotoxin ELISA kits and mycotoxin standards.
http://www.romerlabs.com

The SPEX CertiPrep Certified Reference Materials (CRM) Division offers an unparalleled selection of inorganic standards for AA, ICP, ICP/MS and IC, organic standards for GC and GC/MS, and a range of products for proficiency testing environmental analyses.
http://www.spexcsp.com

Wellington Laboratories Inc. is a world-leading producer and supplier of reference standards of potentially toxic, halogenated compounds that are of environmental concern.
http://www.well-labs.com