Product review (5 stars): Excellent for determining my guitars' and their cases environments.
Excellent devices. I use them in my guitar cases to monitor humidity mainly. They work very well, are quick and responsive, and are certainly accurate enough for my needs. I mainly need to see if there's been a significant shift toward dry air, not the exact humidity. The temp also works perfectly and helps me judge just how wet/dry I want the instruments to be. Recommended.