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.
Do you have a recommendation for a more accurate unit?
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.
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.
because if it says anything other than 10% (the lowest thing it reads), then the dessicant needs to be refreshed.
it’s more of a binary output rather than trying to look at 53 vs 55%
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’ve pretty much been running on the binary theory with the AMS sensor: anything but a 1 is too high. I guess I’m glad I didn’t waste any money on those digital jobbies. I wonder if the old school analog style are better?
Yeah, that seems good enough for most people and I agree with using it instead of wasting the money on these even for a secondary check. I just wanted to track a new desiccant that doesn’t indicate and see how it compares to cheap silica.
The old school probably would work better in that they are often adjustable or calibratable, and I feel like I’d trust them more than these to even accurately change with added humidity. I’m gonna end up using paper Testors cause those honestly seem the more reliable analog system.
yeah, it’s usually 60% ambient humidity here, and then in the dry box it’ll read <15%. so that’s a pretty decent indicator to me that it’s working fine. I don’t really care if it’s 10, 15, or even your 25%, those are all way less than the ambient baseline and let me know that the dessicant is working.
If you’ve got some need to the humidity accuracy then that’s another thing, but for me that’s why I use those cheapos.
I use modified cereal containers with dessicant on the bottom and have a mount modelled up for those sensors.
Fair enough. I guess my point is that since they swing between them so much how do you know you didn’t put a sensor in there that is reading way under humidity and is actually closer to 40% while reading 15?
I guess it doesn’t really matter if it’s just to see if the humidity appears to be increasing over time but that difference between them makes me worry I won’t catch if it’s actually matching humidity because of a difference between the readouts.
I’m also a very OCD nerd about certain things so, that’s not helping me with these. I feel I can’t compare any one of them against another for much purpose but only use them singularly at best for humidity change trend if I’m actively tracking it.
Say outside is reading higher than actual and inside is reading under actual and you might miss them being technically the same. I also just got non indicating desiccant so that’s another reason I kinda care.
I used 10 rectangular one for my dry boxes because they are cheap and its a rectangular one that was supplied with the Prusa enclosure.
It’s good to know that they seem to be more accurate than the round one.
@Krauerking@lemy.lol Hygrometers are only as good as their components. Buying a DHT11/22 or SHT31 from AliExpress ($1-2) alongside an ESP8266/32 and you’d have much better results than buying these “are my cigars dry” pucks.
I’d really love to know how, once having purchased and aquired these two parts, how to join them, and get them powered, and to display. this is like secret engineering knowledge i’d love to be walked through
@shoulderoforion@fedia.io I have about $150 worth of Ali parts and components coming just this month for whole house monitoring for this kinda thing - temp, humidity, CO2, VOCs, pressure, light sensors etc. Would be glad to ping y’all once that writeup is done :)
LOL same. And this is why I bought bad tech. It’s a whole wild world if you can actually take electronic components and just wire them together and program them yourself.
I’ve been through all the junk Amazon hygrometers, name brands, no name, all junk. How has your experience been with the inkbird ITH10? I hope abe writes up a walkthrough for the DHT11/22 and ESP8266/32 setup, it’d be neat to order from Ali and work something up.
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.
