The DURAN® Class A volumetric flasks with UKAS individual certificate, available in clear and brown, are calibrated under defined conditions in accordance with ISO 1042, DIN 12664 and ISO 17025 standards. – The volume content tolerances conform to accuracy Class A – High precision due to better visibility of the printed ring mark – The blue printed image is highly chemically resistant – Supplied with ergonomic polyethylene stopper for easy and safe tightening or removal – Thanks to the exact processing and precisely calibrated scales, they permit the highly accurate determination and measurements of volume – Maximum minimization of unwanted influences The DURAN® Class A volumetric flasks with UKAS individual certificate, available in clear and brown, are calibrated under defined conditions in accordance with ISO 1042, DIN 12664 and ISO 17025 standards. – The volume content tolerances conform to accuracy Class A – High precision due to better visibility of the printed ring mark – The blue printed image is highly chemically resistant – Supplied with ergonomic polyethylene stopper for easy and safe tightening or removal – Thanks to the exact processing and precisely calibrated scales, they permit the highly accurate determination and measurements of volume – Maximum minimization of unwanted influences