LGC Standards provides products and services to improve measurement and quality control within the laboratory, and is part of LGC, whose LGC Science & Technology Division acts as the UK National Measurement Institute for chemical and bioanalytical measurements. LGC Standards supplies over 100,000 products, including reference materials, pharmaceutical impurity reference standards (produced under ISO Guide 34 accreditation), biological standards and reagents, and proficiency testing. LGC Standards is headquartered in Teddington, Middlesex, UK. Its global centre for excellence in proficiency testing is located in Bury (Greater Manchester). LGC Standards has offices in France, Germany, Italy, Poland, Spain, Sweden, China, Russia, United Arab Emirates and the UK, a joint venture presence in India, and representatives in Brazil, Bulgaria, Czech Republic, Finland, Hungary, Ireland, the Netherlands, Romania, Turkey and the US.