$21.80: CIS 7-in-1 Air Quality Monitor at Amazon

BigBG

Dec 4, 2025 1:13 PM

1.6K Comments

Joined Mar 2023

BigBGDec 4, 2025 1:13 PM

1.6K Comments

lol whatever just buy it, all those words weren't doing anyone any good anyway! In For One. Why Not.

Last edited by BigBG December 4, 2025 at 06:04 AM.

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Cujobob

Dec 4, 2025 2:05 PM

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Joined May 2012

CujobobDec 4, 2025 2:05 PM

1.6K Comments

Quote from BigBG

:

lol whatever just buy it, all those words weren't doing anyone any good anyway! In For One. Why Not.

This is true. Good, accurate sensors are unfortunately not cheap. Sometimes you can get "close enough" depending on your need, but part of the problem is that the way they're implemented matters so much, too.My go to is Air Gradient which costs a fair bit more.

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brasshat

Dec 4, 2025 2:20 PM

61 Comments

Joined Dec 2008

brasshatDec 4, 2025 2:20 PM

61 Comments

Quote from BigBG

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lol whatever just buy it, all those words weren't doing anyone any good anyway! In For One. Why Not.

Which words? I don't follow.

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Obese_ICEagent

Dec 4, 2025 2:21 PM

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Joined Feb 2014

Obese_ICEagentDec 4, 2025 2:21 PM

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For $20, why the hell not? I can finally find out how much my 3d printers are poisoning me

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LEADER7

Dec 4, 2025 2:54 PM

109 Comments

Joined Apr 2017

LEADER7Dec 4, 2025 2:54 PM

109 Comments

Our community has rated this post as helpful. If you agree, why not thank

I have one of these cheap generic air sensors. It's absolute garbage. You might as well set your money on fire.

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mblitch

Dec 4, 2025 2:54 PM

543 Comments

Joined Nov 2004

mblitchDec 4, 2025 2:54 PM

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I can't trust something where they can't even label correctly their own product.

The first graphic has the temperature and humidity identification incorrect, and for some reason in the temperature symbol is showing a percentage sign other than a degree symbol. Too many strikes.

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m3n00b

Dec 4, 2025 3:06 PM

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Joined Sep 2014

m3n00bDec 4, 2025 3:06 PM

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Our community has rated this post as helpful. If you agree, why not thank

Quote from brasshat

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Which words? I don't follow.

26% temp

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nedlymandingod

Dec 4, 2025 3:09 PM

195 Comments

Joined Nov 2013

nedlymandingodDec 4, 2025 3:09 PM

195 Comments

Quote from mblitch

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I can't trust something where they can't even label correctly their own product. The first graphic has the temperature and humidity identification incorrect, and for some reason in the temperature symbol is showing a percentage sign other than a degree symbol. Too many strikes.

26⁰ C is 78⁰ F

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peeplesre

Dec 4, 2025 3:25 PM

278 Comments

Joined May 2007

peeplesreDec 4, 2025 3:25 PM

278 Comments

Quote from LEADER7

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I have one of these cheap generic air sensors. It's absolute garbage. You might as well set your money on fire.

But then you need one of these sensors to see if you're getting poisoned from the money you set on fire. 😀

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brasshat

Dec 4, 2025 3:27 PM

61 Comments

Joined Dec 2008

brasshatDec 4, 2025 3:27 PM

61 Comments

Quote from m3n00b

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26% temp

smh. Thanks, missed that on the small screen this morning.

Sad case of first impressions, but thankfully it looks like it may just be an issue of poorly crafted--either AI or just bad 'shopping--product photos from the seller. All the amzn review photos I've looked at so far seem to indicate the actual product reads "C/F" for the temp label.

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icecreamsocialist

Dec 4, 2025 5:12 PM

6 Comments

Joined Jun 2015

icecreamsocialistDec 4, 2025 5:12 PM

6 Comments

If you don't care about the actual meaning of numbers, then this might be okay. You'll notice in one of the reviews that it was thrown way off by opening the windows then closing them - the CO2 is not measuring actual amounts, just calibrating to the lowest likely value when you get fresh air in. These cheap monitors are only good at telling you general movement. Many cheap air quality sensors don't measure the thing directly, but guess it based on some other measurement and assumptions about its environment. A clue is that a decent CO2 sensor alone (just the electronic part) costs $12-15 in quantity.

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aragorn2000

Dec 4, 2025 6:00 PM

1.4K Comments

Joined Oct 2009

aragorn2000Dec 4, 2025 6:00 PM

1.4K Comments

What is the least expensive consumer device of this kind that is not a toy, and has decent sensors and calibration?

clinteastwood

Dec 4, 2025 6:15 PM

3.8K Comments

Joined Dec 2008

clinteastwoodDec 4, 2025 6:15 PM

3.8K Comments

Quote from aragorn2000

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What is the least expensive consumer device of this kind that is not a toy, and has decent sensors and calibration?

AirGradient One seems decent.
https://www.nytimes.com/wirecutte...y-monitor/

Ozzie4

Dec 4, 2025 6:17 PM

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Joined Jun 2007

Ozzie4Dec 4, 2025 6:17 PM

1.2K Comments

I use a First Air one and find it to be pretty accurate. Amusingly so at times - cooking of course makes it complain about diminishing air quality, but it is true.

My favorite comment on the user reviews for it is that it's so accurate that farting near it causes it to detect an "abrupt drop in air quality".

Edit - just went to look it up and apparently it's been bought by Amazon and is now "Amazon Smart Air Quality Monitor". I've had mine for a few years and really find it to be accurate and useful. Also has a single LED that provides a quick visual reference of air quality that now the whole family is slightly addicted to looking at. ("Why is the sensor yellow?")

Last edited by Ozzie4 December 4, 2025 at 10:21 AM.

Carlosos

Dec 4, 2025 6:34 PM

269 Comments

Joined May 2005

CarlososDec 4, 2025 6:34 PM

269 Comments

Quote from nuy6n6nn

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For $20, why the hell not? I can finally find out how much my 3d printers are poisoning me

The data is most likely fake. I recently looked into those and probably the only real data is the temperature and humidity. Can't have $80+ in sensors in a device that sells for less than the cost of the sensor cost. If I remember from a YouTube video where someone took one of those apart, they use some cheap alcohol sensors to make the numbers change.

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$21.80: CIS 7-in-1 Air Quality Monitor at Amazon

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