Relative humidity
Auto-scaled, but the mould line at 65 % is pinned into view whenever a room is near or above it — so a flat 78 % is still drawn sitting above the line, not floating free.
Absolute humidity — the honest comparison
Grams of water per cubic metre. Unlike RH this is comparable between rooms at different temperatures, and against outside. When the outdoor line sits below a room, airing that room dries it — however high the outdoor RH reads.
Airing gain — how much a window would remove
Room minus outdoor, in g/m³. Above the dashed line, outdoor air is dry enough that opening up genuinely removes moisture; below it the two sensors cannot be told apart. This is the same comparison the cards make, over time — so you can see when the gap is worth using, rather than only whether it is open right now.
Condensation risk — when surfaces are wet
Each room's dew point minus the outdoor temperature. Above the dashed line, anything sitting at outdoor temperature — window glass and its reveal, above all — is condensing. This is the only chart here that shows the mechanism behind window-frame mould, and it cannot be read off any of the others.
Temperature
Auto-scaled — here the shape matters more than the absolute value.
Sensor battery
Whole-percent steps, so the line is a staircase. A drain rate needs weeks of them — the cards say so rather than guessing early.