It is made from high-quality Boro 3.3 glass, offering excellent chemical resistance and durability. This Class A flask ensures precise and reliable volume measurements, making it ideal for analytical and research laboratories. The NS 10/19 ground joint provides compatibility with laboratory equipment, while the PE stopper ensures a secure seal. The blue scale allows easy and accurate volume readings. With batch certification for traceability, these volumetric flasks meet the highest laboratory standards. Supplied in a pack of 2 for convenience.