Pyrex Volumetric Flask, Class A, works certified, USP/ISO/DIN tolerances, 20 mL

Pyrex? Volumetric Flask, Class A, works certified, USP/ISO/DIN tolerances, 20 mL
Complies with ISO 1042 and DIN 12664
Manufactured from borosilicate glass 3.3
Calibrated to the tolerances required by the United States Pharmacopoeia (USP) which are tighter than those of ISO/DIN standards
Each flask engraved with individual serial number and supplied with certificate of calibration traceable to National standards
White enamel inscriptions
With Polyethylene stopper
20mL and 5000mL sizes are supplementary to DIN range.