These have to be the least accurate things I have ever seen.
The rectangular one is accurate or accurate enough and has been what I used but I noticed files all had cutouts for these round hygrometers…
Well from my 6 pack 1 is within a margin of error to even be useful.
I get they aren’t expensive but seems like a waste of money for this bad.
I have an aqara temp/humidity sensor in my AMS. The hygrometer (rectangular type) shows 10% and aqara shows 19%.
I’ve also just been using the hygrometer as a binary if it is > 10% then I change media.
Typing all this up made me realize I need to just set an alert for the aqara to just tell me if it jumps above 20%.