Product review (2 stars): Not good quality. Magnet came off both units from cheap glue...
I bought this product just for monitoring humidity levels in the home, but with the readings they return, I don't they are accurate at all.

However, my biggest gripe, is the cheap glue they used to hold the magnet on the back, comes right off! I had both units on separate refrigerators at one point and they both fell off, with one of them breaking. I had to superglue the magnet back on, which is ridiculous, especially considering I had only had them for a couple of weeks.

Cannot recommend this product...