Product review (5 stars): Very good product
These things are great. I ordered 3 and they all  work perfectly...now I always know the humidity and temp of each area, at a glance. They are also magnetic so they stick to steel panels, refrigerators, etc.

When I first received them, I placed all 3 side by side for a couple of days to see if they were calibrated. All 3 read the exact same figures. That's rare with digital hygrometers