I have to say that the device is very precise. Not only that but also the hygrometer Temperature display. I compared both values with a USB thermometer with very sensitive NTC. To my surprise I discovered that the temperature deviation max. 0.2K is.
(For the non-technicians: temperature variations are given in Kelvin 1K = 1C.)
But the flash is a bit annoying. One can on the back off the alarm and the threshold value for the flashing max 65% but I wish the flashing could be completely off.