Best Co2 Detectors 2025

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Last Updated - 26.07.2025

Best Choice

01

Brandson

Brandson - CO2 Detector WiFi - Meter WLAN Air Quality Tester - Carbon Dioxide Sensor Measurement PPM - Tuya Smart Home - Indoor Air Ventilation Recommended - Temperature - Humidity Hygrometer

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9.9

Exceptional

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Remote monitoring and warning message: You can retrieve the readings of CO₂ concentration in real time via the free Tuya Smart and Smart Life apps. If the limit values are exceeded, the device sends push notifications to your smartphone, so you can take early countermeasures such as airing the rooms (subscription required). Also ideal for remote monitoring in the office or holiday home.
Integration into the smart home: the WiFi CO2 meter can be connected to other smart home devices. If a limit value is exceeded, you can automatically open the windows, switch on an air purifier or activate a ventilation system. | Device sharing allows family members to be integrated and thus together keep an eye on air quality.
Indoor air monitoring via WiFi: Keep control of air quality with the innovative CO2 meter from Brandson Perfect for preventing headaches, fatigue and lack of concentration. You can stay connected to your CO detector at all times via WiFi and receive notifications about CO2 alerts and alarms. The room temperature and humidity are also monitored by the device. | Includes alarm function with snooze. | 307282
Function scope II: the alarm is acoustic and visual (flashing) | adjustable display brightness | integration into the smart home (create scenes) | data recording, graphical display of the values via app | battery indicator | reset button | automatic and manual calibration possible | alarm function with snooze | incl. USB charging cable (type A to C)
Function scope I: CO2 meter with WiFi 2.4 GHz. Comfortable operation on the device or via app Tuya Smart / Smart Life (data update every 5 seconds). Display of CO2, temperature (°C / °F), humidity and time. The limit value for the CO2 alarm is individually adjustable (default setting 1600 ppm). Status LED. CO2 concentconcentrration: Green: 400-800 ppm (very good to good); Yellow: 801-1600 (moderate to bad); Red: over 1600 ppm (very bad, alarm)
Easy to set up. Download the app "Smart Life" or "Tuya Smart" conveniently via the Google Play Store or Apple Store to your smartphone. Compatible with Apple iOS (version 12 or higher) and Google Android (version 6 or higher).
Dimensions: 9.5 cm x 7.5 cm x 3.5 cm. Weight: 166 g. Power supply: large Li-ion battery 2000 mAh, running time up to 14 hours or via power supply. Box contents: WiFi CO2 meter including 1 m charging cable (USB A to C) and operating instructions (English language not guaranteed)

79,85 €
02

Brandson

Brandson - CO2 Detector Meter, Air Quality Tester, Carbon Dioxide Sensor Measurement PPM, Co2 Display, Indoor Air Ventilation Recommended Alarm, Alarm Clock, Temperature Thermometer, Humidity

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9.8

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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With practical alarm function: you will be warned when the CO2 content reaches a critical value (default: 1000 PPM). The limit value can be individually adjusted. Display classification: up to 600 PPM: very good air quality. 601 – 1000 PPM: good to moderate. 1001 – 1500 PPM: moderate to poor. Over 1500 PPM: very poor – urgently supply fresh air
Technical data: measuring ranges: CO2: 400 – 5000 PPM, deviations + - (50ppm + 5%); temperature: -9.9°C to + 50°C; humidity: 0% - 95%; +-6% | dimensions: 82 x 82 mm, depth 26 mm | screen diagonal: 8.5 3,34 inches. Weight: 108 g. Box contents: Brandson carbon dioxide meter with battery, USB to 3.5 mm DC hollow plug cable and instruction manual (English language not guaranteed).
Power supply: hollow plug power connection for charging and power supply operation | integrated Li-ion battery 500 mAh | incl. USB to DC hollow plug cable for battery charging and power connection.
Function: CO2 meter with alarm function, limit values individually adjustable, LCD display with 4 brightness levels via touch, 4-stage round display, alarm clock with snooze function, display of temperature (C and F), time (12/24 h) and humidity, display battery level, feel-good symbols (smilies), ventilation recommendation, CO2 warning and CO2 alarm. | Off switch, +/- button rocker, settings button
Fresh room air at any time. Keep control of air quality with the Brandson CO2 meter. Home and office. Perfect for preventing headaches, fatigue and lack of concentration. Small and compact with battery operation, can be taken and used anywhere. Best readability of the display from all sides. Includes alarm function and display of temperature, humidity and time. | 306118

59,85 €
03

Smartwares

Smartwares Carbon Monoxide Detector, 10 Year Sensor, 1.7 Test Winner Rating, with Display and Test Button - FGA-13041

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9.6

Exceptional

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TEST BUTTON Make sure your device is working properly by testing it regularly (once per month). If your CO detector beeps 5 times during testing, it will work fine.
Effective protection against carbon monoxide (CO): this detector with a range of 20 to 40 m² has an electrochemical sensor that detects the CO in the air, even with a small amount (approx. 27 ppm).
Easy to install: the necessary mounting material is included. Install one CO detector per floor, near your combustion equipment and near rooms. Make sure the alarm of 85 dB is audible by everyone.
DISPLAY: The display of the carbon monoxide detector shows you the CO concentration (PPM) and shows possible malfunctions: batteries or device at the end of life, incorrectly installed.
10 years sensor: the sensor of this CO detector has a service life of 10 years. The detector is powered by 3 AA batteries which are included. You will be warned by bright and acoustic signals that you need to change the batteries or replace your device.

26,17 €
Value for Money

04

X-Sense

X-Sense XC0C-SR Carbon Monoxide Detector, 10 Year Sensor, CO Detector with Replaceable Battery and Digital Display, Carbon Monoxide Detector with Test Button

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20% Off
9.5

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Versatile placement options: this freestanding CO detector can be placed on any flat surface, such as a desk, bookshelf or nightstand; screws for wall mounting are also included
Slim and compact: this small and discreet CO detector measures just 75 × 142 × 32 mm and looks good in any room. Style and safety go hand in hand here
Intuitive operation: thanks to the separate buttons, this detector is quick and easy to use even in emergency situations; it provides reliable access to important functions such as checking CO peaks or testing/mute the alarm
Easy to understand: the current CO value is displayed on a clear display; a three-colour LED informs you at a glance about the status of the detector: red for alarm, yellow for error or low battery and green for normal operation
10 YEAR LIFESPAN Protect your loved ones from the silent threat of carbon monoxide with this reliable CO detector that will accompany you for 10 years! The detector is powered by replaceable AA batteries with a service life of 3 years

15,19 € 18,99 €(20% Off off)
05

Unitec

UNITEC CO2 Meter, Carbon Dioxide Detection, Temperature and Humidity Detection, with Traffic Light Indicator and Voice Alarm, CE Mark

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9.4

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Well-being: Use the air quality sensor to measure your indoor air quality and optimise it according to the indicators
Simple: the CO2 meter is easy to use thanks to its push buttons
Precise: the high-quality NDIR sensor of the CO2 meter achieves maximum accuracy
Practical: quickly and easily assess the indoor air quality with the help of the LED traffic light indicator and the voice alarm of the CO2 meter
Multifunctional: the CO2 meter has a 24 hour real-time carbon dioxide detection as well as temperature and humidity detection
Flexible: with the CO2 meter from Unitec, it is possible to set up on the desk as well as mounting on the wall
Durable: the CO2 meter has a service life of up to 5 years and a backup battery with a service life of more than 12 hours
Comfort: the CO2 meter has a light intensity detection function, which makes it possible to automatically adjust the display brightness

19,98 €
06

ABUS

ABUS CO2 Detector - CO2WM110 AirSecure - Meter for Air Quality, Humidity and Temperature in the Room - with Alarm and CO2 Traffic Light - 10-Year Sensor

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9.2

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Use: for schools, offices, nurseries or at home – avoid bad air – prevent headaches, discomfort and increased number of aerosols in the breathing air
OLED display: displays CO2 content, temperature, humidity, date and time
Mounting: mount warning detector on the wall or place on chest of drawers, table or similar
Function: CO2 detector for monitoring the CO2 concentration indoors thanks to the NDIR sensor - always see whether the indoor air quality is good, normal or poor (traffic light system)
CO2 sensor: max. Service life of 10 years, then replace the CO2 meter
Alarm: warning tone and change of the LED colour display in case of poor air quality - in case of absence, the alarm message can be viewed later

24,90 €
07

Technoline

technoline WL1022 Co2 Meter with Co2 Traffic Light, Co2 Alarm, Ventilation Recommendation

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42% Off
9.1

Excellent

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Main highlights

Wall hanging or table stand
Ventilation recommendation based on the CO2 concentration in the air (coloured display elements)
Swiss-made and patented photoacoustic sensor (PASens) with a CO2 measuring range up to 5000 ppm
MIN/MAX CO2 memory with programmable duration of up to 96 hours
CO2 monitor for monitoring indoor air quality
Built-in memory chip for storing settings
Backlight with adjustable brightness levels
Automatic calibration of the CO2 base line
Adjustable alarm when CO2 is too high or low with optional acoustic alarm

39,95 € 69,99 €(42% Off off)
08

X-Sense

X-Sense XC01-R Carbon Monoxide Detector with Digital LCD Display, CO Detector with Replaceable 5-Year Battery and Peak Memory

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28% Off
8.8

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Precise and reliable: equipped with a Figaro electrochemical CO sensor and a replaceable battery with a life of 5 years
PLEASE NOTE: STANDALONE, NOT COMPATIBLE WITH THE SBS50 BASE STATION
Instant alerts: A loud 85 decibel alarm alerts you of dangerous CO levels early
INTUITIVE LIGHT A 3-color LED indicator flashes red, green or yellow to alert alarm, power supply, or fault
INFORMATIVE DISPLAY An easy to read LCD display shows CO values in real time and stores CO peaks since the previous reset
FLEXIBLE INSTALLATION This detector can be easily installed on the wall or freestanding and can even be used when traveling

21,37 € 29,99 €(28% Off off)
09

LSENLTY

LSENLTY Portable CO Detectors Support 500 Hours Standby Time, 3-in-1 CO Detector (Temperature, Humidity and CO), Alarm Function and Lanyard Design for Camping, Travel, Cars, Orange

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15% Off
8.7

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Warm tips: if there is no carbon monoxide in the environment, the product displays normally: 0000 PPM
Practical design: portable and compact design (dimensions: 0.3 x 6.6 x 1.4 inches), equipped with a lanyard design. The LCD displays the values for temperature, humidity and CO concentration. It can be placed on the desk or hung on the wall or bag, etc. Suitable for camping, travel, car, RV, vehicle, plane, etc.
Portable CO Detector Supports 500 Hours Standby: The standby time of LSENLTY portable carbon monoxide detector can be up to 500 hours. When the detector is plugged in, the device's screen lighting remains on. If the detector is not plugged in, the device will automatically turn off the screen lighting after 5 minutes without the need for operation. The CO detector continues to work and monitors the carbon monoxide concentration. You can turn on the backlight by briefly pressing the power button.
More accurate CO detector: carbon monoxide is detected by electrochemical sensor and the measurement range for carbon monoxide is 0-1000PPM, the accuracy is ±5PPM. Temperature and humidity use an imported Swiss sensor and support a quick update of 2 seconds. The temperature measurement range is -15℃ ~ 50℃, the accuracy is ±1.5℃, the humidity measurement range is 0~99%, and the accuracy is ±5%.
Alarm function: if the value exceeds 50 PPM, an alarm will be triggered. With increasing PPM value, the alarm frequency increases. If you need to turn off the alarm sound, you can short press the button to turn off the alarm sound. However, for safety reasons, the alarm sound will continue after 15 seconds if the CO concentration continues to exceed 50 PPM, even when the alarm sound is off.
10 YEAR SENSOR LIFE:Enjoy more safety and peace of mind thanks to the 10-year lifetime of imported CO sensor.

30,59 € 35,99 €(15% Off off)