Product review (1 stars): Extremely inaccurate
We live in the high desert of the US Southwest and run three humidifiers in different rooms during the winter when heating dries out the air more than usual. I already own three humidity monitors: two Acurite 613s purchased two years ago (now $9 each) and an Extec 445815 purchased three years ago (now $40).

I bought this Honeywell to serve as a check on the other two brands. The two Acurites read very close to each other--usually the same or one percent different. The Extec always reads several percent higher. I tend to trust the Acurites more because they are consistent with each other, but I wanted another opinion, so I purchased the Honeywell.

The new Honeywell monitor has been reading five or six percent lower than the Acurites and nine to eleven percent lower than the Extec, so I have to conclude that the Honeywell is extremely inaccurate, reading far too low. The fact that the Acurites are between the extremes of the other two monitors reinforces my belief that the Acurites--the least expensive of the three--are the most accurate.