Burets with PTFE stopcock is a slender glass tube with a scale,lower termination pipe with frosted glass straight two-piston,the lower end of the flow tube beak piston to control the discharge of the liquid,the flow tube beak to control the liquid flow rate,the upper end of the tube is made of relatively thick bead,in order to enhance mechanical strength. ● Material:High-quality borosilicate glass ● Color:Blue scale white background ● Suitable for scientific research,universities,medical and health of cattle and mining and industrial laboratories and other units,dress solution for titration reactionsolution for medium and alkaline titration reaction.