Product review (5 stars): Excellent and inexpensive product! Use many times a day.
Wonderful product, though confusion ensued when I a) forgot it was a hygrometer first and a thermometer second and b) kind of lost it when the numbers looked off. Turned out the all-important button on the back had it running in Celsius, not Fahrenheit. It's sitting on my desk as I write this, and am oh so glad I bought it.  Comes with a battery (still going strong) and is super affordable. Get one!