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forum threaddoublehelixx | Staff posted Nov 25, 2025 09:00 PM
forum threaddoublehelixx | Staff posted Nov 25, 2025 09:00 PM

CIS 7-in-1 Air Quality Monitor $29.5 + Free Shipping w/ Prime or on $35+

$30

$45

33% off
Amazon
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Amazon [amazon.com] has CIS 7-in-1 Air Quality Monitor for $29.50. Shipping is free w/ Prime or on $35+.
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Amazon [amazon.com] has CIS 7-in-1 Air Quality Monitor for $29.50. Shipping is free w/ Prime or on $35+.

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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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11/30/25Amazon$27
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Sort: Lowest to Highest | Last Updated 12/3/2025, 07:22 PM
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14 Comments

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Nov 25, 2025 09:20 PM
155 Posts
Joined Apr 2023
TealBorder8536Nov 25, 2025 09:20 PM
155 Posts
do anyone know how easy to clean the micro dust sensor?
Nov 25, 2025 10:05 PM
67 Posts
Joined Dec 2016
BlibbergarossNov 25, 2025 10:05 PM
67 Posts
How is this so cheap compared to the competition?
Nov 25, 2025 11:00 PM
616 Posts
Joined Jun 2023
brownedpantsNov 25, 2025 11:00 PM
616 Posts
What would happen if you fart on it? I guess that would be a test to see if it actually does anything.
2
4
4
Nov 25, 2025 11:06 PM
99 Posts
Joined Mar 2008
endgame42Nov 25, 2025 11:06 PM
99 Posts
Quote from Blibbergaross :
How is this so cheap compared to the competition?
No WiFi or Bluetooth connectivity, and the battery only lasts ~24 hours. Definitely not as useful as some competitors.
2
Nov 26, 2025 01:36 AM
179 Posts
Joined Jan 2016
gatsbyleeNov 26, 2025 01:36 AM
179 Posts
I would buy one if it supports zigbee or sth to connect to HA.
Nov 26, 2025 06:21 PM
173 Posts
Joined Dec 2014
bombertoddNov 26, 2025 06:21 PM
173 Posts
Quote from gatsbylee :
I would buy one if it supports zigbee or sth to connect to HA.
Any recommendations?
Nov 26, 2025 06:57 PM
179 Posts
Joined Jan 2016
gatsbyleeNov 26, 2025 06:57 PM
179 Posts

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Nov 26, 2025 11:04 PM
45 Posts
Joined Mar 2012
txkingNov 26, 2025 11:04 PM
45 Posts
does this actually measure co2, hcho, and tvoc or does it cheat like ecobee does and infer them based upon a single measured particle count and then say "meh this sounds good enough" for the others.
Nov 26, 2025 11:13 PM
1,937 Posts
Joined Oct 2014
MtnXfreerideNov 26, 2025 11:13 PM
1,937 Posts
Arent these junk with pretty much fake sensors? They were $13ish last year on temmuu and i got one and it was putting out fake numbers. I assume these are similar quality since its amazon in the US.
Nov 26, 2025 11:14 PM
1,937 Posts
Joined Oct 2014
MtnXfreerideNov 26, 2025 11:14 PM
1,937 Posts
Quote from Blibbergaross :
How is this so cheap compared to the competition?
Garbage sensors
Nov 26, 2025 11:41 PM
187 Posts
Joined Dec 2007
joegoloNov 26, 2025 11:41 PM
187 Posts
Quote from brownedpants :
What would happen if you fart on it? I guess that would be a test to see if it actually does anything.
I would expect no less from brownedpants
3
Nov 27, 2025 12:21 AM
127 Posts
Joined Dec 2017
ShadowPNov 27, 2025 12:21 AM
127 Posts
$18 used like new seems like a fantastic deal.

I'll take a look and see if it does real CO2 or fake one after I get it, I didn't find anyone disassemble it yet
Nov 27, 2025 07:00 AM
3,837 Posts
Joined Sep 2019
LavenderPickle7682Nov 27, 2025 07:00 AM
3,837 Posts
There are fake/junk sensors in this type of product all the time. There's a reason why real ones cost SO MUCH MORE....because they have actual sensors for each of those. Many of these have a single particulate sensor...and "guesstimate" what the other values "should be". Most people don't have TVOCs on hand to calibrate it, so...go ahead and prove it's a fake. The company will wait.
1
Nov 27, 2025 11:36 AM
369 Posts
Joined Nov 2008
HitchItchNov 27, 2025 11:36 AM
369 Posts
I use Airthings 2930 Wave Plus - Radon & Air Quality Monitor, Battery Powered (CO2, VOC, Humidity, Temp, Pressure)
Its a legitimate accurate monitor but its not cheap
https://www.amazon.com/Airthings-...r=1-3&th=1

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