€¢ Complies with ISO 1042 and DIN 12664 €¢ Finely calibrated to Class A tolerances €¢ Each flask is laser etched with an individual serial number, batch code and date of manufacture €¢ Manufactured from chemically resistant borosilicate glass €¢ Conformity 'H' certified €¢ Inscriptions in blue enamel €¢ Supplied with polyethylene stopper €¢ Batch certificate available to download online