Kimax® precision bore micro burets permanently marked with individual serial numbers. Supplied with a Certificate of Graduation Accuracy. Funnel top accepts a one-hole #3 rubber stopper. Short length of glass tubing aids in filling the buret through the tip by vacuum if desired. Stopper and tubing are not supplied. Designed from Federal Specification NNN-B-789, Type I, Style I, Class A requirements. PTFE stopcock for all sizes is PS 2. Scale is durable white ceramic enamel.