NewAir AP-1008DH - Manual (Page 13)

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The cleanliness (pollution) level of the room is
determined by the color at the end of the
penetrating hole.
Clean:Blue Lightly polluted:
Light purple
Polluted:
Dark purple
Highly
polluted : Red
It displays the current cleanliness (pollution) level of the room.
OPERATION/INDICATION PART
How to Use