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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.
I would not be at all surprised to learn that both the commodity round and rectangular units use the exact same components inside. These surely must be made from jellybean off the shelf parts, and at similar price points to each other neither could possibly be assembled with much care or attention to detail.
I have a six pack of the rectangular ones from Jeff Bezos' Knockoff Whitebox Emporium. Even all sealed in the same container with each other, they all disagree by a spread of about 15%. I have no idea which of the six, if any, are actually producing an accurate number.
So, just because my rectangular one has been with me for a few years I'm gonna stick up for it a little. It does have 2 sensors in it separated for temp and humidity compared to the circular ones that seem to have the temp sensor baked into the board if it exists at all and the humidity sensor was poorly soldered upside down. But agreed on likely carelessness of assembly from identical parts.
Same batteries and sensor modules it seems and even the press fit nature of them. And the only reason I know that specific one I'm reading against is accurate is because I only kept it because it was the accurate one from a pack of them I grabbed from a lab in college.
I just don't get why everyone uses them is my point if we are in agreement they kinda suck.