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.

You get your humidity down to less than 10%? Or still literally treating it like a binary thing and it's just reading way under real?

I am at about 25% relative humidity and it's showing as a 1 in the ams sensor so 10% seems impressive even though I'm not using much desiccant.

I don't even think these would helpfully let you know if your cigars are dry. 2 of them barely changed humidity over time and I noticed the sensors were flush with the board instead of exposed.

I ended up buying inkbird ITH10s because I generally don't go completely self made since I'm not overly tech crafty and more work with my hands crafty.

I've had massive differences in readouts in DHT22 from aliexpress. They are really not good sometimes

I am doing some testing with a new desiccant and wanted to have some extra data for humidity. So it is honestly fine for function but not what I was going for.

"It's on 3 now, I should do something."

Does something

Waits two hours

AMS says 2

"Is it at 2.0 and dropping to 1 any moment now, or is it stabilized at 2.9? Or..."

I guess it's not important, but I really would like to have some decimals. It's not that I care about accuracy, but I would like to be able to see which direction it's going.

Nah these do not have a calibration method.

Cheap and seemingly what the average consumer uses based on the 3d files all using them but not calibratable and wayyyyy off.

Working on it. Waiting for some packages.

The rectangular ones are slightly more reliable from personal experience but likely just as possible to be low quality. From working with them the design layout leaves less space to get obvious flaws such as the RH sensor being installed facing the board which seems to be true for most of the round ones, they also have a separate and dedicated temp sensor unlike the round ones and use a double battery setup since voltage can also affect the accuracy of the reading.

But the RH sensor between the units seem to be identical as is the inability to calibrate.

Personally the paper strips are very reliable if just looking for a binary answer of if it's gotten past a threshold and are incredibly cheap.

Abe recommended an electronic daughter board sensor that was cheap but requires skills I don't have.

And I have found medical grade ones that can be purchased cheap "used" as they are often single use for shipping purposes to make sure the item was kept in specific conditions. But that brings me back to waiting for the. To arrive and test.

TL;DR

These cheap electric square or circle ones are both luck based with some preference to the square. But cheap paper humidity sensors can be gotten if you just want to toss them in a bag to make sure they haven't gotten water damaged as a binary identifier.

For reliable accuracy look elsewhere.

Lucky. Pretty sure these are the same from the same internet source but the swing on them is insane. They all showed as 75% in the bags but spending some time with them I realized the complete lack of accuracy when I realized my humidity wasn't what it was reading.

I have since taken some apart and cleaned them out but now those are just under the humidity by the same percent they were over before.

Best of luck. Seems they are kinda luck of the draw.

They can I guess let you know trend of humidity go up or down but also do note that I noticed the sensor was installed upside down so readings also were pretty delayed from real world adjustments.