KIMAX precision bore Class A glass buret is permanently marked with an individual serial number. Supplied with a Certificate of Graduation Accuracy. Filling tube accepts 1/4" I.D. flexible tubing.3-way PTFE No. 2 stopcock allows refilling and titrating. KIM-KAP dust cap is included. Scale is durable white enamel. Designed from ASTM Specification E287, Class A requirements.