10.13 Immediately after recording the hydrometer scale
reading, carefully lift the hydrometer out of the liquid, insert
the thermometer or temperature measurement device and stir
the test portion vertically with the stirring rod. Record the
temperature of the test portion to the nearest 0.1°C. If this
temperature differs from the previous reading (10.6) by more
than 0.5°C, repeat the hydrometer observations and thermometer
observations until the temperature becomes stable within
0.5°C. If a stable temperature cannot be obtained, place the
hydrometer cylinder in a constant temperature bath and repeat
the procedure from 10.5.