Accurate as per class A, DIN ISO 385, ASTM-E287 Compliant Unique features of the Schellbach design include a vertical white stripe with central blue ribbon to facilitate accurate reading of the meniscus and an intermediate PTFE stopcock which facilitates the complete drainage of excess liquid Burette is made of precisely bore high quality, heavy duty Borosilicate 3.3 glass Features chemical resistant blue printing All contents are included in a single package