Kimble kimax serialized and certified burettes used for general purpose titrations requiring traceable volumetric accuracy. Permanently marked with an individual serial number and traceable to nist standards supplied with a certificate of graduation accuracy filling tube accepts 1/4″ id flexible tubing precision ground tips assure uniform outflow kim-kap dust cap is included filled through a self-lubricating ptfe stopcock plug easy-to-read durable white enamel scale reservoir fill style buret designed from astm e287, class a requirements manufactured to the specifications found in astm e694 calibrated to the accuracy requirements found in astm specification e542 manufactured from 33 expansion, low extractable borosilicate glass conforming to usp type i and astm e-438, type i, class a requirements. Warning: this product can expose you to chemicals including tetrafluoroethylene, which are known to the state of california to cause cancer. Prop 65 warning