Kimble kimax serialized and certified micro burets used for repeated small volume titrations requiring traceable volumetric accuracy. Precision bore buret is permanently marked with an individual serial number and is traceable to nist standards supplied with a certificate of graduation accuracy easy-to-read durable white ceramic enamel scale both filling and overflow tubes accept ” id flexible tubing supplied with a chemically-resistant, self-lubricating ptfe stopcock plug 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 e438, 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