Vol. flask class A w/ plastic stopper, individual certificate, 20 ml, mouth size

Made of top quality 3.3 borosilicate glass. With plastic stopper. Designed according to ISO 1042, DIN 12664 and USP standards. The conformity with ''Eichordnung'' (the German Federal Weights and Measures Regulations) is certified through the official ''DE-M (year)'' sign on each flask. Calibrated to contain (TC, In). USP standards are more accurate than ISO 1042. Each flask has its own individual serial number printed on the flask. An individual calibration certificate showing the real volume of this particular flask is delivered