Auriol HG02832A Instructions D'utilisation Et Consignes De Sécurité page 44

The relative humidity:
The temperature- or humidity trend:
The trend will appear as rising (or dropping), when the
temperature changes by 2 °C (= 3.6 °F) or more within
an hour and will maintain the direction for one hour even without any
further change. The humidity trend will respond accordingly with a
change of 2 % in humidity.
Indoor climate rating:
Based on the indoor humidity and temperature the main station will
rate the indoor climate using the following key:
When the indoor temperature is outside the 20 °C–28 °C range no
indoor climate rating will appear.
Low battery:
If the battery symbol appears the batteries in the main
station should be replaced as soon as possible. Please
refer to the instructions in section Starting the main station /
changing batteries.
44 GB/IE
This displays the relative humidity to which the
main station is exposed.
DRY humidity below 40 %
COMFORT humidity between 40 and 70 %,
and a temperature range between 20 °C–28 °C
(68 °F–82.4 °F).
WET humidity higher than 70 %