Product review (2 stars): Had better luck with an Acu-rite for about the same price ...
We compared the measurements to a lab standard, research grade instrument for over 24h.
The Thermopro temperature was always  1.5 F too low and it overestimated the humidity by 4%.
Had better luck with an Acu-rite for about the same price - but we did not test a large number of units.