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5.3 Pipette types
Measuring pipettes and volumetric pipettes are divided into 3 classes: A, AS and B.
Class A and AS pipettes are more precise than Class B pipettes. They vary according to the
elapse time, which depends on the nominal volume and the design. Class AS pipettes are
quick-drain pipettes.
Volumetric pipettes have 1 or 2 marks and are adjusted to flow-out. Measuring pipettes
have a scale and are divided into 4 types.
Type 1 measuring pipette
•
Adjusted to flow-out.
•
Nominal volume is indicated by the lowest scale graduation.
0
•
Aspiration up to the zero line at the upper end of the pipette.
10
•
Dispensing to any scale graduation on the scale.
20
30
40
50
60
70
80
90
100
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