GFL laboratory apparatus are exported to countries all over the world, committing us to ensure transparency and care in the presentation and documentation of our products' safety standards. The GS sign enjoys highest recognition in the field of appliance safety. Ever since its introduction in 1977, it has developed into an internationally acknowledged symbol for "Proven Safety". Its current legal basis is laid down in the Appliance and Product Saftey Law (GPSG), dated 01 May 2004. GFL laboratory apparatus receive the GS sign after an approved and independent testing and certification agency has tested a sample of the product (Product Sample Test) for the required safety standards, and after supervision that only those GFL products are offered that comply with the product sample (Manufacturing Control). Owing to the voluntary testing and certification procedures, the GS sign serves as an independent orientation aid for a secure and easy purchasing decision to importers, dealers and users alike. The GS Certificate (test certificate) has a validity of maximum five years.