Division 8.2.3.6 Weighing

The sample media shall be weighed automatically or manually, as follows:

1. (a)

   For automatic weighing, the automation system manufacturer's instructions shall be followed to prepare samples for weighing; this may include placing the samples in a special container;

2. (b)

   For manual weighing, good engineering judgment shall be used;

3. (c)

   Optionally, substitution weighing is permitted (see point 8.2.3.10);

4. (d)

   Once a filter is weighed it shall be returned to the Petri dish and covered.