Technoline TX29 DTH-IT accuracy?

Hello,
since 2022 i own 5 of these Technoline TX29 DTH-IT wheater stations for indoor usage.

Since i also pre-owned a no-name budget weather station from a discounter, which shows me 10%-points less of the value of the technoline (e.g. 65% humidity technoline vs 55% humidty no-name device), I was pretty sure that these budget device is off, because the accuracy of the technoline was considered everywhere as really accurate … the temperatures also 1-2°C off

These days, i bought a meaco dehumidifier device with built-in humidity sensor, because i never get my room to an acceptable condition regarding humidity.

But to my surprise the dehumidifier shows me now nearly exactly the same value as the no-name device.

Now i have doubt, that these Technoline sensors are off … since i have multiple, i placed 3 of them at the same spot and they are consistent in themself.

So i currently have

Technoline 1: 18,1°C, 65%
Technoline 2: 18,3°C, 63%
Technoline 3: 18,5°C, 63%
Budget: 16,8°C, 55%
Dehumidifier: , 52%

  1. Anyone who has experience with these Technoline stations and its accuracy?
  2. Any idea how i can find finally the “real” humidity in the room?
  3. Any recommendations for accurate devices, prefably zigbee (i could drop off Jeelink completely)

Best regards