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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.
@Krauerking yeah, yuck. The two point with Calcium chloride gives this insight. It has Relative humidity of around 33. If the offsets are constant then they may be worth using, with the ick factor of course. If the offsets don't make sense then the detectors are shot and fit for the bin.
You can get calcium chloride at the hardware store, it's used as Desiccant for damp areas.
DampRid? Wait I already have calcium chloride then.
Ok well I guess I can test if they even scale right but I'm not holding my breath around them, I'm not sure the extra humidity I breath out anyways would register on these.
I really think I might just take the batteries from these and call it a loss and use better components.
Thank you for the testing info! Actually really helpful.