Product review (4 stars): Some issues with the outside sensor.
I have 3 Acu-Rite units.  I put them all near one another and compared them for a few days.  On this particular unit, the outside sensor can be way off, as much as 10-12% on the humidity and up to 5 degrees on the temp.  It does take it a half hour or so for the humidity reading to adjust.  The temperature was fairly accurate indoors.  It would be this particular outside sensor that isn't reliable, but I kept the unit because it still gives me a ballpark figure on the conditions outside when compared with my other unit that also has an outside sensor.  On the plus side, the unit is very attractive sitting on a table, but the stand can be removed if you choose to hang it.  The display is very clear with nice large numbers.