Top 10 Best co2 meter in 2026

Last Updated - 6/7/2026

🏆Best Choice

X-Sense

X-Sense Carbon Monoxide Detector Alarm with Digital LCD Display, Replaceable Battery CO Alarm Detector with Peak Value Memory, XC01-R

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Flexible Installation: Wall-mounted or freestanding; easy to take while traveling
•High Accuracy & Reliability: Advanced Figaro electrochemical CO sensor; 7-year replaceable battery
•Instant Alert: An early warning will be delivered through a loud 85-decibel alarm
•Intuitive LED: 3-colored LED indicator flashes red, green, or yellow to indicate an alarm, power, or a fault
•Informative LCD: Shows CO levels and records the highest detected since the last reset; if CO reaches a dangerous level, the alarm will sound to warn you; for precise real-time monitoring, consider using a CO meter (this model is a CO detector)

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$29.99

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SAF

SAF Aranet4 Home: Wireless Indoor Air Quality Monitor for Office or School (CO2, Temperature, Humidity and More) Portable, Battery Powered, E-Ink Screen, App for Configuration & Data History

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•BREATHE EASILY: Aranet4 CO2 meter measures CO2 levels, temperature, relative humidity, and atmospheric pressure in real-time, empowering you to make informed decisions for healthy ventilation. No wonder it's the top-rated indoor air quality monitor in Amazon's CO2 monitor segment!
•CABLE-FREE: The power-efficient e-ink display guarantees an extended battery life of up to 4 years for this wireless air quality monitor, ensuring worry-free monitoring without the hassle of cables and cords.
•EASY-TO-USE: The color coding, prominent CO2 number on the display, and optional buzzer of this air quality meter alert you when the CO2 concentration becomes too high.
•FREE & INTERACTIVE APP: A smartphone application for viewing and analyzing up to 90 days of historical data from your indoor air quality meter, complete with user-friendly graphs.
•PREMIUM QUALITY: Aranet4 carbon dioxide detectors use nondispersive infrared sensor (NDIR) technology for the most precise and reliable CO2 measurements. Made in the European Union.
•ENJOY THE HEALTH BENEFITS: Air quality monitor indoor use helps people take better care of the atmosphere around them, leading to improved focus, mood, and overall well-being.

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$179.00

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Dienmern

CO2 Carbon Dioxide Detector, Dienmern Portable Air Quality Monitor Indoor, 1600mAh Powerful Battery CO2 Monitor for CO2, Temp(°F), Humidity, LED Display CO2 Detector for Travel/Office/Home/Grow Tents

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•【CO2 monitor】 This CO2 monitor keeps track of CO2, AQI, temperature, and humidity in real time. It’s made to give you clear, easy-to-read info at a glance, so you can stay on top of your indoor air quality and keep your space healthier and more comfortable.
•【Swiss-Made High-Precision CO2 Sensor】 Built with a Swiss-made CO2 Sensor, this air quality tester gives you highly accurate CO2 readings every second. With a wide detection range of 400–5000 ppm and accuracy of ±50 ppm, it keeps you informed of changes in your air. Plus, the added temperature and humidity sensors provide complete indoor monitoring for a healthier environment.
•【Life-Saving CO2 Alarm】 This smart CO2 detector helps protect you from hidden dangers like gas leaks, wildfire smoke, or poor ventilation. The moment CO2 levels climb above safe limits, it sounds a loud alarm right away—so you have time to react and keep your loved ones safe
•【Built-in 1600mAh Battery】 With a built-in 1600mAh lithium battery, this air quality monitor can run for up to 72 hours on a single charge. It supports USB charging and is lightweight enough to carry around, while also perfect for keeping in one spot at home or the office.
•【Smart Visual Display】 This indoor air quality monitor comes with a bright LED screen that shows CO2, AQI, temperature, and humidity in real time. The clear visuals and high contrast make it easy to read at a glance, anytime—day or night—so you always know what the air around you is like.
•【Necessity of Air Quality Monitoring】Low levels of carbon dioxide detector are generally harmless, but when the concentration exceeds a certain limit, it can affect breathing in humans and other living organisms. In severe cases, it can even become life-threatening. Therefore, monitoring CO2 levels in the air is essential for maintaining a healthy environment.
•【Note】Dear customer, just a heads-up: CO2 meters can have a little variation of around ±50 ppm. That’s simply because each CO2 meter uses a different sensor, so the readings might not be exactly the same. Thanks for your patience and understanding.

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$19.99

$25.99

-23%

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Temtop

Temtop CO2 Monitor Indoor air Quality Monitor Portable CO2 Meter, CO2, Temperature, Humidity Home, Office or School

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•【Multifunctional CO2 monitor】Real-time CO2 detect, humidity and temperature monitor. CO2 detection range: 400-5000PPM. Temperature detection range: -10-60°C (14-140°F). Humidity detection range: 0-99%RH.
•【Cost-effectiveness and 70 days standby】the latest Photoacoustic CO2-Sensor incorporates intelligent algorithm , offering dual detection modes and using up to 70 days ! It provides you with the most cost-effective CO2 detector.
•【Mini and Multi Application】Small and thin , easy to carry, also with a detachable stand and adsorptive back cover. You can check air quality anywhere and anytime.
•【Multiple alarm modes 】the color coding and optional alarm, will sound the warning when the CO2 concentration exceeds the limit.
•【No Disturb for a Worry-Free Life】the sound alarm can be turned off, and without backlight, no noise and light disturbances, allowing you to easily fall asleep at night.
•【What's Included】 Detector x 1, USB cable x 1, User manual x 1, Bracket or accessories set x 1.
•【Tip】 For real-time monitoring, we recommend keeping the device plugged in. This will enable real-time monitoring mode, providing you with the most accurate and timely air quality data. Please note that this is a CO2 monitor and cannot detect carbon monoxide (CO).

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$45.99

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YISPK

Air Quality Monitor, Professional Air Quality Detector with CO2 Monitor/HCHO/TVOC/Temperature/Humidity for Home, Hotel, Office, Car

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•5 in 1 indoor air quality monitor, it tracks carbon dioxide (CO2), formaldehyde (HCHO), volatile organic compounds (TVOC), temperature and humidity, helping you stay aware of air quality and potential health risks.
•Ideal for various settings including homes, offices, schools, and hotels, this monitor helps maintain a healthy environment by continuously tracking airborne pollutants and climate conditions.
•Simple to set up and operate, making it accessible for anyone concerned about indoor air quality without the need for professional installation.
•Up to 20 hours of continuous use, you don't need to keep it plugged in. This indoor air quality meter is small and portable, can detect the gas quality in bedroom, living room, kitchen, office, car, school, hotel, cellars, restaurant, campground and other environments.
•By integrating advanced laser particle sensors with temperature and humidity sensors, making high-precision air quality monitoring more accessible than ever.

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$23.99

$29.99

-20%

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U UNNI

U UNNI CO2 Monitor Carbon Dioxide Detector for Home, 3 Adjustable Volume for Alerts & 3 Adjustable Backlight, Photoacoustic Sensor for Temperature Humidity & Indoor Air Quality Monitor

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•CARBON DIOXIDE DETECTOR for HOME, SWITCH °C/°F – Great item for any home to monitor the weather and air quality! Real-time CO2 value, temperature and humidity, CO2 history chart, CO2 Concentration range, 3 Adjustable Volume for Alarm Setting & 3 Adjustable Backlight, Max/Min Data, Low battery indicator.
•HIGH-PRECISION SENSIRION CO2 SENSOR – Equipped with Swiss-made Photoacoustic Sensor provides precise and reliable readings, which gives you peace of mind about the air in your home. CO2 detection range：400～5000PPM,accuracy：+/- 5% + 50PPM. Temperature range: 14.2°F ~ 122°F, Humidity range: 20% to 95 %.
•IMPROVE VENTILATION – Very useful for high concentration of poor air quality and cooking indoors and it will indicate to open a window/door to refresh the area to get the levels lower. CO2 monitor for Home, RV, Grow Tents.
•INDOOR AIR QUALITY MONITOR - Detect rise and decrease in carbon dioxide level, perfect for anyone wanting to monitor air quality! Elevated CO2 can cause symptoms like headaches, drowsiness, allergies and difficulty concentrating, to keep an eye on air quality at home or work!
•USB POWERED OPTION & BATTERY BACKUP & ADJUSTABLE BACKLIGHT – It is plugged in which allow the multi brightness display to stay on all the time, if you prefer. Either set it on tabletops, or mount it on the wall. 3 x AAA Battery(not included) for Backup & outdoor manual calibration.
•calibration process:Place the device in a standard calibration environment of 400PPM,Press and hold the ALERT button, and power on the device or install the battery,The device will sound "Bi-BI" and the screen will display the "CAL" character and keep blinking,After three minutes of calibration, the "PASS" character will be displayed. Power off and power on the device.

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$39.99

$59.99

-33%

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SwitchBot

Air Quality Monitor Indoor 5-in-1 Meter Pro CO2 Detector, CO2 Alarm, CO2 Monitor with APP, Large Display, Bluetooth Air Quality Tester for Home, Office, 2-Year Data Storage (Meter Pro CO2)

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•5-in-1 Multi-Functional Display Screen: SwitchBot Meter Pro CO2 features a 92-millimeter large screen that simultaneously displays CO2 levels, temperature & humidity, time, date, and comfort level. This indoor air quality monitor makes it easy to monitor your environment and decide when to ventilate for a healthier living space.
•High Precision Sensor: Built with Swiss-made NDIR sensors, this CO2 monitor accurately monitors air quality by measuring CO2 levels every 1 second with an accuracy of ±50 ppm and a range of 400-9000 ppm. Its high sensitivity and stability ensure rapid and precise air quality feedback.
•3 Alarm Methods: Customize CO2, temperature, and humidity range with trigger alerts. When limits are exceeded, you'll be notified via sound alarms, visual screen alerts, and app notifications (SwitchBot Hub required). With this air quality monitor, you can continuously and effectively track air quality.
•Portable and Durable: Our air quality detector measures 92mm x 79mm x 25mm and weighs just 154g. It has a built-in battery with up to 12 months of life and a low battery warnings. Features wall-mount holes and an adjustable bracket for versatile placement in any environment.
•Sleek Design for Any Space: Featuring a modern, minimalist look, SwitchBot Meter Pro CO2 blends effortlessly into your living room, bedroom, or greenhouse. Also perfect for offices, gyms, classrooms, factories, or hotels, its versatile design ensures it fits seamlessly while keeping you informed about air quality.

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$69.99

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Inkbird

INKBIRD IAM-O2 Indoor CO2 Monitor | 3 in 1 CO2 Detector | Temperature & Humidity Air Quality Monitor | Up to 6 Months Battery Life | Dual Alarm System | for Home, Office, RV, School

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•[3-IN-1 DETECTOR] The IAM-O2 3-in-1 indoor air quality monitor can monitor CO2 concentration, temperature and humidity changes in real time through the backlit LCD screen.
•[LONG-LASTING BATTERY LIFE-- ENERGY-EFFICIENT & COST-SAVING] Advanced low-power technology reduces electricity consumption, enjoy 3-6 months of uninterrupted use on a single charge, eliminating the hassle of frequent recharging or keeping it plugged in 24/7 like other detectors.
•[HIGH-PRECISION SENSOR] Equipped with a Swedish CO2 sensor, it can accurately measure CO2 concentrations from 0-9999ppm; NDIR sensor, which can simultaneously measure temperature (accuracy up to ±0.2°C, ±0.36°F) and humidity (accuracy up to ±1.8%RH).
•[DUAL ALARM SYSTEM] The CO2 meter has a dual alarm system of sound and indicator light. The green light indicates good air quality, the yellow light indicates medium, and the red light warns of unhealthy.
•[PORTABLE SAFETY GUARD] The IAM-O2 CO2 monitor can be placed flat on the table or hung on the wall. It is flexible and convenient and suitable for any indoor environment.
•[PERMANENT SETTING MEMORY] Built-in power-off memory chip can permanently lock all personalized parameters. Even if there is an accidental power outage, the settings will not be lost.

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$39.89

$56.99

-30%

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Walfront

Air Quality Monitor Indoor CO2 Detector Carbon Dioxide Meter 5 in 1 HCHO TVOC Temperature Humidity Tester for Travel Home Grow Room

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•1 SECOND UPDATE: The air quality monitor can update the system 1 second in real time, and can directly detect air quality without calibration
•ACCURTAE DETECTION: The high performance analysis chip is used to accurately catch the weak current generated in the electrochemical process of CO2 Detector for more accurate detection
•BATTERY LIFE: The CO2 detector stands by time is about 240 to 360 minutes
•MULTIPLE USES: 5 in 1 meter can detect carbon dioxide concentration in air, and HCHO, TVOC, Temp, Humi
•SCRATCH ABS: Air quality meter adopt excellent ABS material, possess impact , scratch , environmentally friendly

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$21.25

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Metellme

Handheld Carbon Dioxide Detector,CO2 Meter,3 in 1 Portable CO2 Detector,Temperature and Humidity Meter,Smoke Tester,CO2 Detectors for Home,car,rv

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•This instrument uses an infrared sensor;
•Measuring CO2 content, temperature, humidity;Temperature unit:℃/℉ conversion;
•LCD two-line display,showing both CO2 content and temperature and humidity;
•Green/yellow/red backlight prompt function;
•Measurement result HOLD function;Automatic shutdown function;
•Powed by 3 AAA Batteries

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$19.98

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