Borosil Boroflo Burettes ("Burets") provide users with the ultimate flow control. Replaceable Boroflo PTFE Screw-Thread Keys create a chemically-resistant, leak-proof system which requires no lubrication whatsoever. Each Borosil Burette is calibrated by automatic laser calibration. Certificates can be downloaded by visiting Borosil , or by downloading the Borosil app. Avail. from 10mL to 100mL. Burettes comply with IS 1997: 2008/EN ISO. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil Type 3. 3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil Glassware is stress-free and incredibly resistant to thermal shock.