Best Co2 Detectors 2025

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Last Updated - 10/06/2025

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 limit values are exceeded, the device sends push notifications to your smartphone, so you can take countermeasures at an early stage, such as airing the rooms. 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 €
Value for Money

02

Technoline

Technoline CO2 Meter

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23% Off
9.8

Exceptional

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Suitable for e.g. home/apartment owners, schools/lecture halls, offices, hospitals, nurseries, public institutions, clubs, etc..
Practical CO2 traffic light display (green/yellow/red) with ventilation recommendations for quick assessment and interpretation of the current CO2 concentration / automatic CO2 base line calibration (ABC); also manually calibrated.
Powered by a supplied power supply with a 1.75 m long cable.
Individually adjustable upper limit alarm (visual or acoustic) for CO2 concentration.
Can sit on a table.
CO2 meter / CO2 monitor / CO2 amp for continuous monitoring of CO2 concentration (carbon dioxide concentration), indoor temperature and humidity (rH) / measurement method: Single-beam NDIR (non-dispersive infrared technology).
Built-in ROM memory to save settings.
Backlight with adjustable brightness levels.
Acoustic alarm with up to 85 dB volume.

69,00 € 89,99 €(23% Off off)
03

Putogesafe

Putogesafe Carbon Monoxide Detector with LCD Display, 10-Year CO Detector with Replaceable 3-Year Battery, Portable CO Alarm with Peak Memory for Motorhome/Ship/Room, EN50291-Certified, Pack of 1

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19% Off
9.6

Exceptional

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Main highlights

Memory for CO peak concentration: The LCD display automatically records and stores peak CO levels, allowing you to determine if an alarm was triggered in your absence based on the recorded spikes.
Durable protection: A 10-year service life for CO detectors with 3-year replaceable batteries ensures safety in the home, reducing costs for your family.
Compact and portable design: Wall mounted or freestanding, 2 mounting options available. The compact and portable design of the carbon monoxide detector makes it suitable for a variety of situations, e.g. in offices, hotels and travel.
Child- and elderly-friendly: This CO alarm has a 3-colour LED display (green, yellow, red) that indicates various operating states such as alarm, low battery or malfunction along with sound signals that make it easy to identify the alarm status.
Advanced CO (carbon monoxide) sensor: The CO detector is equipped with an electrochemical CO sensor that quickly and accurately detects dangerous CO concentrations from 23 ppm to 999p pm and emits an alarm sound of more than 85 dB to warn you as early as possible.

18,97 € 23,49 €(19% Off off)
04

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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13% Off
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

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 € 28,88 €(13% Off off)
05

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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9.3

Excellent

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Main highlights

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 €
06

DGSFFHFSD

Carbon Monoxide Warning Detector LCD Display CO Detector 85 dB Alarm Carbon Monoxide Sensor Carbon Monoxide Detector with Test Button Battery Operated (without Batteries) GAS-96776

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19% Off
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

Quality assurance: We specialise in the development and production of carbon monoxide warning detectors. We offer you 30-day 100% return guarantee and lifetime customer service. Your satisfaction is our greatest motivation. If you have any further questions, please contact us directly. We will answer you within 24 hours.
LCD display: carbon monoxide as a deadly breathing gas, you cannot perceive it with your natural senses. The LCD of the carbon monoxide detector shows the carbon monoxide concentration when the air contains 30 ppm. Thanks to the LCD display of the gas detector, you can read and monitor the CO concentration at any time and avoid the occurrence of hazards.
Highly accurate CO sensor: the carbon monoxide alarm uses sensors based on The CO detector continuously measures CO densities in its ambient air. As soon as the concentrations reach corresponding limits, these detectors give an audible alarm. As a rule, you will attract attention when flashing LEDs.
Flexible and easy installation: no wiring and sockets required, because our battery-operated CO detector screws and wall dowels are available, which can be quickly and easily installed anywhere.
85 dB alarm and battery drive: In an emergency, the carbon monoxide alarm sounds an alarm over 85 dB, which can immediately alert people throughout the house. The carbon monoxide alarm uses the replaceable batteries (2 x 1.5 V AA). A "chirp" every 30 seconds indicates what is reminiscent of low batteries and ensures that you don't miss a battery change. (Batteries not included)

16,55 € 20,49 €(19% Off off)
07

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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9.1

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

18,99 €
08

XIIW

CO2 Meter, NDIR Air Quality Indoor Air Monitor, WiFi Power Saving CO2 Detector with Portable Alarm, CO2 Thermometer with Digital, Temperature Humidity, Carbon Dioxide Meter for Home Office

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9.0

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

Recommended use: If the test values are high, place the device in a ventilated place for 5-10 minutes, then restart the calibration function or perform manual calibration. If you do not like the sound, you can disable the sound output in the app.
Compatible with Tuya app: you can monitor the carbon dioxide concentration, temperature and humidity in your home at any time via the mobile app, turn off the screen in time and the data can also be transferred to the app via WiFi.
CO2 visualisation and sound alarm: the carbon dioxide detector has 5 levels of carbon dioxide concentration, which are displayed in five colours. When the CO2 concentration value reaches or exceeds 1500 PPM (the alarm value can be set via the mobile phone), the product emits an alarm that reminds you to ventilate in time.
Battery and charging: Our air quality monitor automatically turns off the screen to reduce energy consumption. The corresponding battery can last 8 hours without connecting to the power supply, which is convenient for mobile use. However, it is recommended to connect the USB data cable for continuous power supply.
Air quality meter: the CO2 detector is small and exquisite in design, suitable for any room. The screen is clear and adjusts the screen brightness to the ambient brightness, which is convenient for use at night.
3-in-1 CO2 meter: the carbon dioxide detector can detect the concentration of carbon dioxide and can also record the humidity and temperature. It is suitable for air quality detection of any room to ensure the health level of the room.

47,99 €
09

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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8.9

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

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. | 306648

59,85 €