DURAN® burettes are made of highly chemical resistant borosilicate glass 3.3 and are only used for titration. The quantity of liquid required for titration, which is unknown beforehand, can be precisely read off once the reaction is complete. Their precise scaling makes them particularly suitable for titrimetric purposes. The amount of liquid required for titration, but previously unknown, can be read off very accurately after the reaction has been completed. Automatic burettes have an adjusted inlet tube (automatic zero point adjustment) so that excess solution runs back into the burette bottle.– Complies with ISO 385 – Graduated, main volumes ring marked – With Schellbach stripe – With reservoir bottle (2000 ml) and rubber air pump – Side-positioned standard ground stopcock – 30 seconds waiting time – The volume content tolerances conform to accuracy Class AS – Delivery consisting of burette, burette bottle and rubber air pump DURAN® burettes are made of highly chemical resistant borosilicate glass 3.3 and are only used for titration. The quantity of liquid required for titration, which is unknown beforehand, can be precisely read off once the reaction is complete. Their precise scaling makes them particularly suitable for titrimetric purposes. The amount of liquid required for titration, but previously unknown, can be read off very accurately after the reaction has been completed. Automatic burettes have an adjusted inlet tube (automatic zero point adjustment) so that excess solution runs back into the burette bottle.– Complies with ISO 385 – Graduated, main volumes ring marked – With Schellbach stripe – With reservoir bottle (2000 ml) and rubber air pump – Side-positioned standard ground stopcock – 30 seconds waiting time – The volume content tolerances conform to accuracy Class AS – Delivery consisting of burette, burette bottle and rubber air pump