the upper part of the stopper shall have an indentation to permit
the thermometer (see 6.1.9 (a)) to be read down to a temperature of -30°C. A pointer shall be fitted to the upper surface of
the stopper to facilitate location of the thermometer in relation
to the bottom of the test jar. A spring wire clip shall be used to
retain the thermometer in the correct position.
6.1.8 Pipet with Filter Unit:
6.1.8.1 A Pipet,, of clear glass with a calibration mark
corresponding to a contained volume of 20 6 0.2 mL at a point