Product review (4 stars): Nice features but poor temperature linearity
The unit has good wireless range.  It has nice features but its temperature accuracy is poor.  I checked its humidity readings against other units and the accuracy was acceptable.  However, the temperature readings were off by 1-2F over a rather small tested range between 60F and 80F. Although the unit can be calibrated to match any single independent temperature reading, the temperature sensor has poor linearity so it can not be calibrated to be accurate over a range of temperatures. The specified temperature accuracy in the manual is +/-1F over the range of 30 to140F indoor and +/-1F over -40  to 140F outside. In reality, in my unit it is much worse. Considering the unit features versus its price, I rate it 4 stars.  1 star off because of the poor temperature linearity.