Pipettes

Graduated pipette

• Equipped with a volume scale, ideal for versatile use
• Suitable for hobbyists, schools, households, winemakers, and wet chemistry professionals

Volumetric pipette

• Features a single calibration mark, offering higher accuracy but less flexibility compared to graduated pipettes

Pasteur pipettes

• Designed for drop-by-drop dosing
• Dosing is facilitated by a rubber suction bulb

Pipettes are essential in laboratories for precise liquid dispensing.

Working with a pipette:

To drain liquid, hold the pipette vertically against the receiving vessel wall, which should be angled. After draining, observe a 15-second wait time. Wipe the pipette tip against the vessel wall. Pipettes are calibrated to drain, and the remaining liquid in the tip is factored into the volume measurement. This liquid should never be blown out, as it may alter the volume under thermal stress. Clean using low-alkalinity detergents and air-dry.

Peleus ball

Pipettes are elongated glass tubes with pointed ends, marked with rings to measure specific liquid volumes. They are calibrated for discharge (Ex). The Peleus ball, a pipetting aid, was invented by Friedrich Pels Leusden of the University of Kiel's Institute of Hygiene. It features three valves:

A - Air release valve

B - Aspiration valve

E - Emptying valve

To aspirate liquids, follow these steps:

• With the pipette inserted, open valve ‘A’ and squeeze the ball
• Dip the pipette into the liquid and press valve ‘B’ to aspirate liquid to the desired mark
• Press valve ‘E’ to empty the pipette