Product review (1 stars): HIGHLY INACCURATE!
Highly inaccurate!  The outdoor temperature was within acceptable range -- +2 degrees -- as was the humidity reading but the indoor temperature was +5 degrees off and the humidity was nearly 10 points off.  I went to the AcuRite and found out lots of buyers were experiencing similar problems.  It is evident from all the comments posted by buyers that this  manufacture's customer service was practically nonexistent.  I returned the unit to Amazon for a refund.
The concept of this unit is a good idea in combining both outside and indoor temperature and humidity in an easy to read and install unit.  While some units may end up having acceptable readings, the problem is that these units are made in China and designed to be sold cheaply in the US and elsewhere.  To keep manufacturing costs at the lowest possible levels, quality control does not apply in their process, so no effort is made to properly calibrate the units.  You may or may not get a unit the reads temps and humidity within reasonable levels.