Borosil Class B Amber Boroflo, Screw Thread Stopcock With PTFE Keys Burette (2132)2132 Burettes, Boroflo, Fitted With Boroflo GP (General Purpose), Screw Thread Stopcock With PTFE Keys, Accuracy as per Class B of IS 1997: 2008 EN ISO 385, Amber Generally used in the Titration process Comes with PTFE key that is highly resistant to chemical attack No need to lubricate it as PTFE key is used The volume content tolerance conforms to Class B of IS and ISO Product code Capacity n ml Graduation Interval ml Tolerance ml Quantity Per case