Product review (5 stars): Spot on
Works great for me so far. Seems accurate, side by side with my AcuRite. I included a picture of the monitor inside a mason jar with a 62% humidity pack, and it's spot on.  It fluctuated occasionally but never beyond +/- 3% I had previously tried another brand that had a larger display and 3 red buttons along the right edge, but it never powered on. This one cost a couple bucks more, and seems to by styled after the Caliber. So long as it lasts, I may buy others.