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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.
Mine work somewhat okayish, which is within the margin of error I need them for. I think there was one that was terrible though.
Mostly I use them for the temperature aspect, mostly for reminding me if it's too hot or cold in my room (because due to my autism, I often don't notice whether I'm at a comfortable temperature). I have a few scattered about my room and basically they act as a visual prompt to consciously ask myself if I'm at a comfortable temperature, and to act as a rough backup to whatever I'm feeling (because even when I'm consciously aware that my temperature is feeling Bad, I can't reliably tell whether I'm too hot or cold, so these terrible thermometers at least help me answer "should I get a blanket, or open a window?"