Product review (1 stars): Really hate it when companies make claims with their name (AcuRite) ...
I put the indoor sensor (main base station) and the outdoor sensor along with a third sensor that I knew was accurate in the same pitch black, controlled environment. The known accurate sensor said 74/30%, the AcuRite indoor sensor said 74/30% humidity and the outdoor sensor said 70/22%.  Surprise! The outdoor sensor is inaccurate.  At the very least both of the temperature sensors in this package should read the same thing.

Really hate it when companies make claims with their name (AcuRite) only to find out that it's not accurate or right.

EDIT: And now the hanging sensor has stopped showing the correct humidity.  It continually says the humidity is 1%. This thing is a piece of junk, downgraded to one start.