Techno Line WL 1020 Manuel D'utilisation page 28

five-star rating within 15 seconds.

The sensor testing mode will be turned off after 5 minutes,
in order to save energy and prevent batteries from being
drained too fast.

The display will keep that status of last measuring showing
in display
Air quality display

Air quality is displayed by 5 star symbols, who change
accordingly to the measured CO2 value:
Symbols displayed Value
range
< 500
ppm eq
EN8
Air quality
Outstanding