I bought this to monitor the humidity of my mushrooms. A good cheap, starter unit.
Also bought some for our extended family before the winter season starts. We have all noticed the difference in their breathing and sleep.
Its handy to monitor humidity near air purifier.
Very good and useful instrument. I live in a house with exposed beams & no insulation. Very surprised at the humidity readings at ground level,up roof height are very big differences so great for keeping eye on what can potentially be a dust mite or moisture issue in room. Ours is freezing in winter & stinking hot in summer. Really takes humidity off the room.
Love it use every nite ,wouldn’t be without it