Volumetric Flasks Class A Pyrex 250ml. High quality, class Pyrex volumetric flasks with tight tolerance levels and ground glass necks. Complete with polyethylene stoppers.• Complies with ISO 1042 and DIN 12664• Calibrated to the tolerance required by the United States Pharmacopoeia (USP) which is tighter than those of ISO/DIN standards• Each flask is laser etched with an individual serial number batch code and date of manufacture• Batch certificate available to download online• Conformity 'H', certified• Manufactured from chemically resistant Pyrex® glass• Inscriptions in white enamel• Polyethylene stopper
