CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels $39 at Amazon

$39 $55

Amazon has the CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels on sale for $39 with free shipping. Includes alarm if CO2 level exceeds 1880ppm. Measures humidity, temperature, HCHO, and TVOC. Also displays date & time. 

$39 retail: $55
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Myself
Myself
Ben's cred: 377
Posted 10/17/2025 at 05:43 PM PT
Posted 10/17/2025 at 05:43 PM PT
Why is HCHO always on these things? Is that common in some places? Or just cheap to measure?
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CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels at Amazon

Posted 12/04/2025 in Heating & Cooling
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CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels at Amazon

Posted 12/02/2025 in Heating & Cooling
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CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels at Amazon

Posted 12/01/2025 in Heating & Cooling
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CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels at Amazon

Posted 11/30/2025 in Heating & Cooling
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CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels at Amazon

Posted 11/25/2025 in Heating & Cooling
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CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels at Amazon

Posted 11/21/2025 in Heating & Cooling
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CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels at Amazon

Posted 10/17/2025 in Heating & Cooling
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CIS 7-in-1 Indoor Air Quality Monitor w/ CO2 Levels at Amazon

Posted 09/26/2025 in Heating & Cooling