10 Best Co2 Meter Reviewed - Updated May 2024

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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

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.

Sale2

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

【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.

Sale3

CO2 Meter Air Quality Monitor Handheld CO2 Monitor 0~9999ppm Measurement Carbon Dioxide Temperature Humidity Detector NDIR Sensor Indoor Outdoor Air Quality Tester

【HIGH ACCURACY】CO2 Accuracy: 0~2000ppm(±50ppm or ±5% of the reading); 2000~9999ppm(±10% of the reading)
【LARGE MEASURING RANGE】CO2: 0~9999ppm ; Temperature: -10~60°C(Accuracy ±0.6°C) ; Humidity: 0.1% ~ 99.9%RH(Accuracy ±3%RH) ; Dew Point: -20.0~59.9°C ; Wet Bulb: -5.0~59.9°C
【USER-FRIENDLY】Portable Handle Design, Easily manual calibration on CO2 and humidity, Stable NDIR CO2 sensor
【 POWER SUPPLY】Dual power source: battery (included) or 9V adaptor (**NOTED: adaptor is not included in set). Power from battery is automatically cut off when 9V adaptor is in use
【APPLICATION】IAQ monitoring and survey, especially on CO2 level and air ventilation become widely applied in public areas such as offices, classrooms, factories, hospitals, and hotels.

KATZEIST CO2 Detector, Air Quality Monitor Mini CO2 Meter Portable Detector Temperature Humidity Air Analyzer Digital for Home, Office, Travel (3 in 1-Semi)

Multi-Function Monitoring: This indoor air quality tester measures carbon dioxide levels, temperature, and humidity, providing comprehensive indoor environmental data to understand real-time air quality and comfort
Intuitive Interface Quick Response: Air quality monitor come with a clear display screen. we can easily obtain the required data through a simple interface. CO2 meter have a fast response capability,enabling real-time monitoring of CO2 concentration changes
Simple Operation Steps: Just long press the"on-off" key on the right side 3 seconds to turn on and off CO2 monitor. Then you can press the"on-off" button to change temperature mode（°C to ℉）
Lightweight and Portable: The size of air monitoring device is 3.5*2.7*1.4'', allowing to carry and use them anytime, anywhere. Once the co2 exceeds the normal range, it will alarm you
Versatility Across Various Settings: The CO2 detector is applicable in diverse scenarios, including offices, schools, laboratories, medical facilities, gricultural planting, production warehouse,etc., catering to the environmental monitoring needs of different sectors

PinoTec CO2 Detector, Indoor Air Quality Monitor, 2 in 1 Carbon Dioxide Detector Air Quality Monitor, TVOC Meter, CO2 Meter,Battery Powered,Home Air Test Kits for Office

【Healthy INDOOR AIR AT ALL TIMES! 】 Keep control of the air quality with the PinoTec CO2 meter! At home as in the office. Perfect for preventing headaches, fatigue and lack of concentration. Small and compact with battery operation, can be taken and used anywhere. Good display visibility from all sides.
【2-in-1 CO2 Monitor】 CO2 detector, The carbon dioxide monitor can test carbon dioxide, TVOC, built-in 5V, large capacity battery, easy to charge with USB cable.
【Rechargeable】The air quality monitor has a built-in big rechargeable battery and a data cable. When the battery symbol on the screen starts to flash, it means that the battery is insufficient, and it needs to be charged as soon as possible. The charging time is about 4 hours, and it can be used for more than 8 hours with one charge.
【Visual Alarm System】 It makes the carbon dioxide concentration status clear at a glance, the intuitive and vivid expression of comfort, plus the indicator light that changes color according to different levels of carbon dioxide concentration. Icon display: 0~800ppm(Green-good) 800~1200ppm (Yellow-slight) 1201~1500ppm (Orage-slightmoderate) over 1500ppm☹ (Red-serious).
【Widely Application and Products Include】: The CO2 monitor design is simple and portable, It can be easily put in your pocket . It is also suitable for living room, bedroom, baby room, conference room, library and other places. What you get :CO2 monitor *1, USB data cable*1, manual*1

Sale6

3 in 1 Real time CO2 Detector Plug in USB,CO2 Monitor Sensor with 4 Color Lights Alarm,Air Quality Monitor,℃/℉ Temperature and Humidity Tester Meter,Carbon Dioxide Detector for Indoor,Home,Office

【Note】1. This instrument is suitable for long-term air monitoring. Due to the sensitivity of the sensor, it needs to wait for the value to stabilize before reading, rather than immediately, which usually takes a few minutes. 2. After starting the machine, the temperature displays ℃ and needs to be switched to ℉ by pressing the on button. 3. This instrument is suitable for household air detection with slightly lower accuracy. If you need a more accurate instrument, please choose another one.
External USB DC5V Power supply: Connect USB DC5V Or DC mobile power supply, can be used all the time, use the battery The icon shows full power status.Note: USB DC5V is recommended because of high power consumption of detector External power supply.
DC3V battery: Two AAA 1.5V batteries (not include in package)are installed in the battery box of the back shell, which can be used continuously for a few minutes. When choosing battery power, Battery symbol shows the actual battery level. When the battery is low, the detector will automatically shut down.
No need to calibrate after starting up, work and detect automatically. The sensors of some models work intermittently which wont affect the product itself.Widely used in indoor homes, educational institutions, fitness venues, and offices
There is a protective film on the product screen.Before use, please remove the film on the screen surface first,this will make the screen clearer

Sale7

Klein Tools ET110 CO Meter, Carbon Monoxide Tester and Detector with Exposure Limit Alarm, 4 x AAA Batteries and Carry Pouch Included

ACCURATE CO GAS MEASUREMENT: Detect and measure carbon monoxide gas levels with precision using our easy-to-use CO meter
PORTABLE AND PROTECTIVE: Carry our CO detector anywhere for user safety, with a built-in short-term exposure limit (STEL) alarm
DUAL ALARM SYSTEM: Stay informed about CO levels with both low (35 ppm) and high (200 ppm) level alarms, ensuring prompt action
AUDIBLE AND VISUAL ALERTS: Receive immediate warnings through audible and visual alarms, providing increased safety and peace of mind
CLEAR DISPLAY: Backlit display shows CO measurements (0 to 1000 ppm) and temperature (Fahrenheit and Celsius) for easy reading

Sale8

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, 400-5000ppm

🏕️ [High-precision CO2 Sensor]: The CO2 detection adopts the most advanced sensor of Swiss Sensirion's unique PASens technology, and adopts the photoacoustic detection principle to perform accurate and reliable measurements in a wide range of concentration areas and applications.
🔔 [Carbon Dioxide Concentration Alerts]: The CO2 concentration alert value can be customized to make our life, work or production environment safer.
💧 [Temperature and Humidity Monitor]: Temperature and humidity are closely related to human body, plants or storage environment. This air quality tester has the function of real-time monitoring of temperature and humidity.
⏰ [Clock Calendar and Alarm Clock]: This indoor air quality meters can also be used as a daily clock and alarm clock, with multiple functions to make life more convenient.
⛺ [Wide Range of Applications]: This CO2 sensor is widely used in agricultural planting, greenhouse vegetables, production warehouses, raw material processing, daily life, computer room, wine cellar, RVs, schools, cafes, etc.

Sale9

CO2 Carbon Dioxide Detector, Indoor Air Quality Monitor 4-in-1 Portable CO2 Monitor, Tester for Carbon Dioxide, Temperature & Relative Humidity, CO2 Meter with Alarm, for Home, Car, Grow Tents, Travel

Indoor CO2 Monitor: Compact size Body with hollow back design for carring and airflow. Big colorful LCD digital screen for people easy to identify and read. Not only monitoring the CO2 content, also can test the temperature & humidity. Air quality monitor is Keeper of family health, Perfect for home interior, such as living room, baby room, classroom, office and which closed places etc.
Necessity of Air Quality Monitor: Carbon dioxide (CO2) is not harmful to human body when it is low, but when it overs a certain amount, it will affect the breathing of humans (and other organisms). If serious, life is threatening. Thus, we have to monitor the CO2 content of air for keeping health.
Advanced NDIR Technology: Mini CO2 meter uses high precision NDIR sensor technology to detect carbon dioxide content accurately and quickly. and it can hazard assessment, when CO2 of air exceed the setting alarm value(alarm value: 1000 PPM), it will warn to remind people to open the window or turn on air purifier for keeping balance of air.
Air Semiconductor Sensor: 4-in-1 air quality monitor adpots intelligent air semiconductor sensor to test the temperature and humidity value of air. Compare with the common sensor, it is more sensitive, accurately and stable.
Convenient for Carrying: CO2 Monitor built-in 1600mAh battery. It can be used continuously for about 8 hours after full charging.So don't worry, take the CO2 meter to anywhere you want go.

LSENLTY Portable CO2 Detector, 2s Refresh High Accuracy Carbon Dioxide Monitor, 3 in 1 CO2 Meter(Temperature, Humidity and CO2 Value), 96 Hours Standby Time CO2 Monitor for Travel Camping Home Office

Portable Carbon Dioxide Detector: The product has a compact size (size: 7.6x7x3 cm) and is equipped with a strap design, suitable for hanging on the wall, car, or backpack. Suitable to use for camping, hanging on the wall in the living room or bedroom at home, or placed on the desktop in the office.
3 in 1 Air Quality Monitor: LSENLTY 3 1 CO2 monitor not only has all the basic functions (CO2, temperature, and thermometer hygrometer monitor) but also smart functions such as remote monitoring, CO2 concentration, temperature, and humidity graph We support this. Our indoor CO2 detectors are reliable and easy to use in homes, greenhouses, etc.
High Accuracy & Fast Refresh Time: With a high-quality smart sensor, CO2 accuracy is ±50PPM (CO2 detection range: 400-5000PPM) and temperature is up to ±1.8℉ (temperature detection range: 14-122℉). correct. Humidity is ±5%RH (humidity detection range: 0 to 95%RH). Always see the latest changes in CO2 concentration, temperature, and humidity with an update rate of up to 2 seconds.
CO2 Alarm Function: When it exceeds 1500ppm, the alarm will sound automatically, and you can also set different alarm ranges according to your needs. You will receive an alert as soon as CO2 exceeds a preset range. Understand the condition of bedrooms, baby rooms, wine cellars, basements, plant nurseries, and other areas.
CO2 Concentration Stage: This CO2 detector is designed with 3 stages of CO2 concentration: normal stage (400-700 ppm), warning stage (700-1500 ppm), and danger stage (1500-5000 ppm). LSENLTY CO2 detector provides you with a healthier life.

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