10 Best carbon dioxide detectors of 2025

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Best Choice

1

Newentor
Newentor CO2 Monitor, Indoor Air Quality Meters, Carbon Dioxide Detector with Voice Alert, Large Display CO2 Tester, Temperature Humidity Sensor, Alarm Clock for Home, RV, Grow Tents, Black
Main highlights

High-Precision CO2 Sensor
Features Swiss Sensirions PASens technology for accurate CO2 measurements across various environments.

Versatile Application Scenarios
Ideal for homes, RVs, grow tents, and more, ensuring safe CO2 levels.

User-Friendly Display and Alerts
Bright, colorful display with customizable CO2 alerts praised by customers.
9.9

Exceptional

Our Rating

9.3
clearly written

8.0
User interface

8.0
Precision
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Value for Money

2

Kidde
Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-In Wall with 9-Volt Battery Backup, Digital LED Display
Main highlights

Easy Installation with Battery Backup
Simply plug into a 120V outlet; 9V battery ensures operation during power outages.

Ideal for Gas and CO Monitoring
Perfect for homes with natural gas, propane, or potential CO leaks.

Highly Rated Audible Alarm
Customers praise the loud 85-decibel alarm for effective alerting.
9.6

Exceptional

Our Rating

9.7
Noise level

9.5
Easy installation

9.5
clearly written
3

Kidde
Kidde Carbon Monoxide Detector, Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable

33% Off
Main highlights

Battery Powered Convenience
Operates on 2-AA batteries, includes Test-Hush button for easy testing and silencing.

Ideal for Multi-Level Homes
Perfect for bedrooms and living areas, especially with wood-burning stoves.

Highly Rated Alarm Performance
Praised for its loud, effective alarm and reliable detection.
9.4

Excellent

Our Rating

9.9
Easy installation

9.7
worth the money

9.7
Simple to use
4

Kidde
Kidde Carbon Monoxide Detector, Plug In Wall with AA Battery Backup, Test-Hush Button

34% Off
Main highlights

Easy Installation and Battery Backup
Simply plug into a 120V outlet; includes 2-AA battery backup.

Ideal for Homes with Gas Appliances
Perfect for homes with gas stoves and furnaces.

Highly Praised Loud Alarm
85-decibel alarm effectively alerts even heavy sleepers.
9.2

Excellent

Our Rating

9.7
Easy installation

9.5
worth the money

9.5
Simple to use
5

LSENLTY

LSENLTY Upgraded Carbon Dioxide Detector Plug in Wall Design, 3 in 1 CO2 Detector(Temp, Humidity and CO2 Value), High Accuracy CO2 Meter with Alarm Function and Manual Calibration for Home Office RV
9.1

Excellent

Our Rating
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6

Eujgoov

CO2 Detector Carbon Dioxide Detector Air Quality Monitor Temperature Humidity Air Analyzer
9.0

Excellent

Our Rating
7

FIRST ALERT
First Alert CO605 Plug-In Carbon Monoxide Detector with Battery Backup , White

40% Off
Main highlights

Easy Installation with Backup Power
Plug-in design with battery backup ensures continuous CO monitoring.

Ideal for Home Safety
Perfect for multi-level homes and RVs, detects CO effectively.

Highly Rated for Reliability
Customers praise its reliable CO detection and easy setup.
8.9

Very Good

Our Rating

9.7
Easy installation

9.5
Simple to use

9.5
clearly written
8

SHYEEH
Carbon Monoxide Detectors, CO Detector Battery Powered, Carbon Monoxide Alarm with Sensitive CO Sensor, LCD Display and Sound Warning for Home, Bedroom, Kitchen

10% Off
Main highlights

Advanced Electrochemical Sensor
Detects dangerous CO levels accurately and quickly with UL2034 compliance.

Ideal for Older Homes
Perfect for monitoring CO levels in older homes, especially during winter.

Real-Time LCD Display
Praised for its clear CO level readings and ease of use.
8.6

Very Good

Our Rating
9

Lunarlipes

Lunarlipes Portable 4-in-1 Carbon Monoxide Detectors, Mini Carbon Monoxide and Carbon Dioxide Monitor with Magnetic Suction, RV CO CO2 Detector Alarm Temp/Humidity Sensor, CO CO2 Air Quality Monitor
8.5

Good

Our Rating

9.1
Easy installation

8.4
worth the money

8.4
clearly written
10

FIRST ALERT
First Alert CO400 Carbon Monoxide (CO) Detector, Battery Operated Alarm, 1-Pack
Main highlights

Continuous CO Monitoring
Battery-operated, providing uninterrupted monitoring even during power failures.

Ideal for Home Safety
Perfect for bedrooms and each level of your home.

Highly Praised Alarm
Customers appreciate the loud, effective 85-decibel alert.
8.4

Good

Our Rating

9.3
Easy installation

9.3
clearly written

9.1
Precision

10 Best carbon dioxide detectors of 2025

1

Newentor CO2 Monitor, Indoor Air Quality Meters, Carbon Dioxide Detector with Voice Alert, Large Display CO2 Tester, Temperature Humidity Sensor, Alarm Clock for Home, RV, Grow Tents, Black

9.3

8.0

8.0

2

Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-In Wall with 9-Volt Battery Backup, Digital LED Display

9.7

9.5

9.5

3

Kidde Carbon Monoxide Detector, Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable

9.9

9.7

9.7

4

Kidde Carbon Monoxide Detector, Plug In Wall with AA Battery Backup, Test-Hush Button

9.7

9.5

9.5

5

LSENLTY Upgraded Carbon Dioxide Detector Plug in Wall Design, 3 in 1 CO2 Detector(Temp, Humidity and CO2 Value), High Accuracy CO2 Meter with Alarm Function and Manual Calibration for Home Office RV

6

CO2 Detector Carbon Dioxide Detector Air Quality Monitor Temperature Humidity Air Analyzer

7

First Alert CO605 Plug-In Carbon Monoxide Detector with Battery Backup , White

9.7

9.5

9.5

8

Carbon Monoxide Detectors, CO Detector Battery Powered, Carbon Monoxide Alarm with Sensitive CO Sensor, LCD Display and Sound Warning for Home, Bedroom, Kitchen

9

Lunarlipes Portable 4-in-1 Carbon Monoxide Detectors, Mini Carbon Monoxide and Carbon Dioxide Monitor with Magnetic Suction, RV CO CO2 Detector Alarm Temp/Humidity Sensor, CO CO2 Air Quality Monitor

9.1

8.4

8.4

10

First Alert CO400 Carbon Monoxide (CO) Detector, Battery Operated Alarm, 1-Pack

9.3

9.3

9.1

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