Product review (5 stars): Inexpensive, Accurate, and Trivial to Set-Up
I received this unit today and checked the calibration against several other thermometers and hygrometers that I have.  The temperatures are within a degree or two and the humidity reads the same.  All I had to do was pop two lithium batteries in each unit and hang the external sensor on a screw in my garden shed. I would definitely buy again.