Techno Line WL 1035 Manual De Instrucciones página 25

The readings are displayed in the steps: GUT (good), NORMAL
(normal), MITTEL (middle), SCHLECHT (bad) and SEHR
SCHLECHT (very bad).
The overall air quality concentration level
The overall air quality level is indicated by the coloured chart on the
right side of the display together with related ventilation
recommendation on the basis of PM2.5/CO /TVOC readings:-
2
EN6