Page 126 - The Veterinary Laboratory and Field Manual 3rd Edition

The selection, use, maintenance and quality control of laboratory equipment and supplies 95

Figure 2.61 Erlenmeyer flask. Photo: Willy Figure 2.62 Measuring flask. Photo: Willy
Schauwers, Provincial Institute for Hygiene, Schauwers, Provincial Institute for Hygiene,
Antwerp, Belgium. Antwerp, Belgium.

Markings on the side indicate the total
capacity in millilitres. Liquids are measured in
a graduated cylinder by pouring the liquid into
the cylinder until the bottom (low point) of
the meniscus is level with the desired volume
mark.

Pipettes
Pipettes (Figure 2.64) are used in laboratory
work to measure and are calibrated ‘to deliver’
or ‘to contain’ liquids.
Graduated and volumetric pipettes are TD =
Figure 2.63 Graduated (measuring) cylinder. Photo: to deliver. These pipettes are designed to dis-
Willy Schauwers, Provincial Institute for Hygiene, pense the correctly measured volume, so there
Antwerp, Belgium. will be a minute amount of liquid left in the

tip. Serological pipettes are TC = to contain. To
accurately dispense the measured volume the
last bit must be blown out.

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