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expiredphoinix | Staff posted Dec 04, 2025 11:10 AM
expiredphoinix | Staff posted Dec 04, 2025 11:10 AM

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

$22

$45

51% off
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Amazon [amazon.com] has CIS 7-in-1 Air Quality Monitor for $21.80.
Shipping is free with Prime or on $35+ orders.

Price
$23.53 lower (52% savings) than the typical price of $45.33
$2.42 lower (10% savings) than the previous price of $24.22

Customer reviews
3.9⭐ / 203
100+ bought in past month

amazon.com/dp/B0CWS5317P [amazon.com]

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Deal Details
Product Info
Community Notes
About the Poster
Amazon [amazon.com] has CIS 7-in-1 Air Quality Monitor for $21.80.
Shipping is free with Prime or on $35+ orders.

Price
$23.53 lower (52% savings) than the typical price of $45.33
$2.42 lower (10% savings) than the previous price of $24.22

Customer reviews
3.9⭐ / 203
100+ bought in past month

amazon.com/dp/B0CWS5317P [amazon.com]

My other deals

Community Voting

Deal Score
+9
Good Deal
Visit Amazon

Price Intelligence

Model: CIS 7-in-1 Air Quality Monitor, Indoor Humidity Monitor, Temperature, CO2, TVOC, HCHO, Time, Date Display Desktop Air Quality Tester, Air Quality Meters for Home Office Hotel Restaurant School

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Sort: Lowest to Highest | Last Updated 12/24/2025, 03:33 PM
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21 Comments

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Dec 04, 2025 01:13 PM
1,461 Posts
Joined Mar 2023
BigBGDec 04, 2025 01:13 PM
1,461 Posts
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 07:04 AM.
1
5
Dec 04, 2025 02:05 PM
1,554 Posts
Joined May 2012
CujobobDec 04, 2025 02:05 PM
1,554 Posts
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.
Dec 04, 2025 02:20 PM
32 Posts
Joined Dec 2008
brasshatDec 04, 2025 02:20 PM
32 Posts
Quote from BigBG :
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.
Dec 04, 2025 02:21 PM
926 Posts
Joined Feb 2014
nuy6n6nnDec 04, 2025 02:21 PM
926 Posts
For $20, why the hell not? I can finally find out how much my 3d printers are poisoning me
3
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3
Dec 04, 2025 02:54 PM
108 Posts
Joined Apr 2017
LEADER7Dec 04, 2025 02:54 PM
108 Posts

Our community has rated this post as helpful. If you agree, why not thank LEADER7

I have one of these cheap generic air sensors. It's absolute garbage. You might as well set your money on fire.
7
3
Dec 04, 2025 02:54 PM
518 Posts
Joined Nov 2004
mblitchDec 04, 2025 02:54 PM
518 Posts

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

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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Dec 04, 2025 03:06 PM
914 Posts
Joined Sep 2014
m3n00bDec 04, 2025 03:06 PM
914 Posts

Our community has rated this post as helpful. If you agree, why not thank m3n00b

Quote from brasshat :
Which words? I don't follow.
26% temp
1

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Dec 04, 2025 03:09 PM
185 Posts
Joined Nov 2013
nedlymandingodDec 04, 2025 03:09 PM
185 Posts
Quote from mblitch :
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
Dec 04, 2025 03:25 PM
267 Posts
Joined May 2007
peeplesreDec 04, 2025 03:25 PM
267 Posts
Quote from LEADER7 :
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. 😀
2
Dec 04, 2025 03:27 PM
32 Posts
Joined Dec 2008
brasshatDec 04, 2025 03:27 PM
32 Posts
Quote from m3n00b :
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.
Dec 04, 2025 05:12 PM
6 Posts
Joined Jun 2015
icecreamsocialistDec 04, 2025 05:12 PM
6 Posts
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.
Dec 04, 2025 06:00 PM
1,377 Posts
Joined Oct 2009
aragorn2000Dec 04, 2025 06:00 PM
1,377 Posts
What is the least expensive consumer device of this kind that is not a toy, and has decent sensors and calibration?
Dec 04, 2025 06:15 PM
3,398 Posts
Joined Dec 2008
clinteastwoodDec 04, 2025 06:15 PM
3,398 Posts
Quote from aragorn2000 :
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/
Dec 04, 2025 06:17 PM
1,113 Posts
Joined Jun 2007
Ozzie4Dec 04, 2025 06:17 PM
1,113 Posts
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 11:21 AM.

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Dec 04, 2025 06:34 PM
266 Posts
Joined May 2005
CarlososDec 04, 2025 06:34 PM
266 Posts
Quote from nuy6n6nn :
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.
1

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