Burette Clamp, Extension 2

Quick Answer: The Burette Clamp, Extension 2 is an extension clamp for burettes with two slim arms ending in small black tips, closed by a wing nut and carried on a long rod that fits a boss head. Its photograph shows a longer, lighter-looking grip than the Extension 1.

Specifications

Slim Jaws on a Long Reach

Where the Extension 1 has broad, flat pads, the Extension 2 photograph shows narrow arms that meet in small tips, rather like tongs. Narrow tips take up little room around a burette, which helps when a pH electrode, a stirrer shaft or a second tube also has to fit above the same beaker.

A narrow grip also means less contact area, so the jaws must be closed a little more firmly to stop a burette sliding down. Tighten the wing nut gradually while pulling gently downward on the burette, and stop as soon as it no longer moves.

Rod length, jaw opening and the material of the black tips are not stated in the title, so compare them with your stands and glassware before ordering in bulk.

Care & Handling

• Check that both small tips are in place before each use; a lost tip leaves bare metal against the glass.
• Store the extension clamp for burettes flat in a drawer so the long rod does not bend.
• Keep the black tips away from solvents such as acetone, which soften some plastics and rubbers.

Applications

• pH titrations, where the burette shares the beaker opening with a pH electrode
• Holding a burette over a beaker on a stirrer plate
• Supporting a thin glass tube, such as a capillary or drying tube, in a small assembly
• Holding a thermometer in a crowded set-up where broad jaws would get in the way

Why Choose LabEquip

Analytical and teaching labs that run pH or conductometric titrations, where the space above the beaker is shared, tend to choose slimmer jaws. The Extension 2 is listed in LabEquip’s General Lab Products range; send your requirement with the number of stands.

Frequently Asked Questions

When would I choose the Extension 2 over the Extension 1?

Choose the slimmer pattern when space above the beaker is crowded, for example by a pH electrode or stirrer. The broad pads of the Extension 1 spread the grip more and suit set-ups where space is not a concern.

Why does a burette slip in narrow jaws?

Narrow tips touch the glass over a small area, so they need a little more closing force. Tighten the wing nut in small steps while pulling gently on the burette until it holds.

Can this clamp be used in a potentiometric titration?

Yes, as the burette holder. In a potentiometric or pH titration the burette, electrode and stirrer all sit over one beaker, and a slim clamp leaves room for the electrode holder.

What should I do if a black tip comes off?

Stop using the clamp on glass until the tip is replaced or the jaw is covered, because bare metal can scratch or chip the burette. A short length of rubber or vinyl tubing pushed over the jaw is a common temporary fix.

Does the rod fit a standard boss head?

It fits any boss head whose slot accepts the rod diameter. Measure the rod or confirm it when you enquire, and match it with the boss heads already on your stands.

Can it hold a tube at an angle?

Burettes must hang vertically, but other items can be tilted. Turning the rod in the boss head before tightening tilts the jaws, which can hold a test tube at a slant for heating.

Last Updated: September 2026