I bought three to compare to see if they actually agree with other. Thermostat is set to 20 C.
Not too bad if you ask me. The temps are within 0.1 C of each other, and the biggest difference in humidity reading is only 2%.
BTW, what are the different alarm settings? It doesn't explain it in the instructions. I'd be happier if there were no alarm at all actually, as it just confuses things the way they set it up. Furthermore, the alarm is so quiet that it fairless useless.