1.neurtal glass 2.high quality 3.competitive price 4.ISO 9001:2000 1621 Volumetric Flask ground with glass stopper.1ml,2ml,5ml,10ml,20ml,25ml,50ml,100ml,200ml,250ml,500ml,1000ml,2000ml.1621 Volumetric Flask(with ground-in glass stopper or plastic stopper)Capacity(ml)Campacity tolerance(ml)Ground mouthHeight(mm)50.027/1174100.027/1190250.0310/13110500.0510/131401000.112/141702000.1514/152102500. ...