Product review (5 stars): There was good correlation to the readouts from both units when placed ...
The unit is working well at a distance from the outside unit to the inside unit of about 120 feet through 3 interior walls.  The interior display unit is sharp and clear and very stable on the read outs for both the inside and outside temperature and humidity.  There is some latency in updating the "actual" temperature based on some tests from moving the outside unit from the refrigerator to room to outdoors.  There was good correlation to the readouts from both units when placed together in various temperature and humidity locations, always agreeing to within the accuracy of the sensors.