There are two main types of glass pipettes:

• Volumetric pipettes can have 1 graduation mark or 2 graduation marks
• Graduated pipettes have graduations which vary according to the volume

Volumetric pipette with 2 calibration lines

Volumetric pipette with 1 calibration line

Graduated pipette

Glass pipettes are also divided into two precision classes usually indicated on the pipette: class A and class B.

Class A pipettes are more accurate than Class B pipettes. However, this precision is given for a temperature of 20°C, and any deviation from this reference leads to a decrease in precision.