ISO 4796-1 compliant. Thread acc. to DIN 168-1 and approximate graduations. The ring mark on the shoulder of the 100ml to the 2000ml bottles makes the filling height of the nominal capacity visible. The 25ml bottle has a specially shaped glass rim for pouring (eliminating the need for an additional pouring ring). Neutral glass / Type I glass in compliance with USP/EP and JP. With easy to read scale and large labelling field for easy marking. Highly durable white ceramic. With Retrace code (Batch identification). Certificate available via the Internet. Autoclavable.With blue PP screw cap and pouring ring.