Precision bore burets are permanently marked with an individual serial number and include a 2mm stopcock plug. Scale is a durable white ceramic enamel. Burets are designed from ASTM Specification E287, Class A requirements. Delivery stem of buret 89001-618 is 115mm long and meets ASTM D664 potentiometric titration buret requirements. Ordering Information: Burets are supplied with a Certificate of Graduation Accuracy and include a KIM-KAP* dust cap.