Hi,
I’m experiencing much too high humidity sensor values with Ikea Vindstyrka in comparison to a dump humidity sensor. First search engine hit was this, which describes my problem exactly (on the wrong platform). Are there more users observing this? Or do I have an especially inaccurate version and yours is working fine?
For me it’s not an suitable option to transform the value afterwards. For that I could have bought a cheaper version without a display.
Too high for a dump one? Guess first thing todo is consult the data sheets of both devices to get an idea what they promise at first 
In case they don’t even tell it might be already a bad sign (expecting like +/-10% or more inaccuracy) - still you could check the sensors/chip’s them self inside the device to still hunt down hard facts 
Hello,
I am having the exact same problem. In my case it is 8% higher than 2 other sensors. I have tried changing the device at Ikea but I got the same pattern with both devices.
Shame …
