10 Best Carbon Dioxide Data Logger of 2025

Tested and Reviewed: Top 10 Carbon Dioxide Data Logger deals with expert ratings from 8.1 to a perfect 10

August 2025 Edition

Editor's Choice

9.7

Onset HOBO

Onset HOBO MX1102A Bluetooth Carbon Dioxide, Humidity and Temperature Data Logger

Editor's bottom line:

“This carbon dioxide data logger is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Integrated Sensors for Carbon Dioxide, Humidity and Temperature Measurements in an Indoor Environment
Wireless Transmission of Recorded Readings to Smartphones or Tablets Using Bluetooth Smart LE Communications
0 to 5000ppm, -20°C to 70°C and 1% to 90% RH Measurement Ranges with a ±50ppm, ±0.21°C and 2% RH Accuracy
(4) User-Replaceable AA Alkaline Batteries with 6 Month Life (5 Minute Sampling Rate)
Includes Command Strip, Double-Sided Tape, Hook & Loop Strap and (4) AA Alkaline Batteries. HOBOmobile App Available on the Apple Store and Google Play

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Picked by 170 people today

9.5

Save 20%

Extech

Extech CO210 Air Quality Carbon Dioxide Data Logger

20% OffFree Shipping

Main Highlights

Checks for Carbon Dioxide (CO2) concentrations
User-adjustable high/low alarms
Maintenance free NDIR (non-dispersive infrared) CO2 sensor
Indoor Air Quality displayed in ppm with Good (0 to 800ppm), Normal (800 to 1200ppm), Poor (>1200ppm) indication
Datalogs up to 5333 points of each parameter

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9.5

GZAIR

GZAIR WiFi Air Quality Monitor Detects Carbon Dioxide, PM2.5, 1.0, TVOC, Temperature, and Humidity, IoT Controller with Relay Function, Data Logger, Smart Home (Only Supports 2.4 GHz Wi-Fi)

Free Shipping

Main Highlights

6 IN 1: Measure PM2.5, PM1.0, TVOC, CO2, Temperature, and Humidity, with a sensitive laser particle sensor, laser TVOC sensor, and accurate NDIR CO2 sensor.
Automatic & Manual Calibration: Offer two calibration modes, Manual Calibration, and Automatic Calibration. We have calibrated it manually in the factory, and it can automatically calibrate during the detection.
Wi-Fi Enabled & APP Smart Control: Smart PT02 can connect to the Internet, works seamlessly with Tuya App, Set alerts, receiving air quality measurements anytime and anywhere. (Note: Use the 2.4 GHz Wi-Fi band)
Wireless IoT Controller: Create a Smart Scene in the Tuya app, make PT02 control the Smart home appliances. First, you should add Smart PT02 and other Smart home appliances to Tuya APP. Then set the conditions. The PT02 monitor will activate Smart Fans, Air Purifiers, or other appliances in response to changes in your homes air quality.
Supports RS485/Relays Signal Output: The RS485 port and Relay port are located on the rear of the device. And the RS485 supports data export. The Relays can control the appliances directly (This function is only recommended for professional personnel or engineers.)

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9.2

Save 5%

Lascar Electronics

Lascar Electronics EL-USB-CO300 Carbon Monoxide Data Logger, 0 to 300 ppm, 32,000+ Readings, 3 Month Battery Life

5% OffFree Shipping

Main Highlights

User-programmable alarm thresholds
All data loggers come with software
1 year warranty
Direct-to-USB connection and easy-to-use functionality

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9.0

GZAIR

GZAIR CO2 Data Logger Monitor, IAQ CO2 Detector, Dual-Channel NDIR Sensor, Tabletop Carbon Dioxide Meter with Data Export, Temperature and Humidity, 0~5000ppm Range

Free Shipping

Main Highlights

Dual-channel NDIR Sensor: Provide high accuracy and fast measurement response.
Data Logger & Export data: You can view up to 7 days of history reading. It allows you to change the tracking intervals to determine how often your device logs track points. And you can export data to a .txt file and save it on your PC.
Flexible Touch Screen: 3.5 inches large colorful TFT Capacitive Touch Screen, compact and elegant appearance.
PIN Code Access Feature: You can set up a screen lock to help secure your device.
Multiple Customization Options: You can customize the screen feature according to your preference, such as language, brightness, color, etc.

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8.8

Lascar Electronics

Lascar Electronics EL-USB-CO USB Carbon Monoxide Data Logger, 32,000+ Readings, 3 Month Battery Life

Free Shipping

Main Highlights

32,510 CO readings
-35 to +80°C / -31 to + 176°F range.
0 to 1000 ppm

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8.6

GZAIR

GZAIR CO2 Data Logger Monitor, Wall-Mounted Carbon Dioxide Detector, IAQ CO2 Detector, NDIR Sensor, Temperature and Humidity, 0~5000ppm Range (CO2 Detection Human/Plant Mode)

Free Shipping

Main Highlights

Unlimited data logging and memories: Built-in 2GB memory card is used to permanently record the measurement data.
View Trend Chart in GZAIR dashboard: Logged data can be output to computers for storing. Or upload the data file to the GZAIR website dashboard for analyzing.
Accurate Measurement: Using NDIR CO2 Sensor technologies to detect CO2, Temperature, and Humidity. The date and Time are displayed on the big LCD simultaneously.
Beeper and LED alarm: User-adjustable CO2 high/low alarm limit, if the CO2 value in the room exceeds the pre-set value, the instrument will respond with visual and audible warning tones.
Human/Plant Mode: Human mode measures the carbon dioxide level in close space and reminds you to ventilate timely to get good air quality; Plant mode detects whether the plant is growing in a good condition.
Offer two ways to calibrate the sensor: Manual Calibration and Automatic Calibration. Follow the steps in the Operating Instruction to perform the manual calibration. And it can automatically calibrate itself every two weeks during the detection.
Reminder: Please use a 5V, 2A power adapter or charger.

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8.3

AMTAST

Carbon Dioxide Data Logger CO2 Detector Monitor Indoor CO2 Air Quality Meter Temperature Relative Humidity Data Logger AMF-102

Free Shipping

Main Highlights

Super large LCD simultaneously display and log CO2 Level, Temperature, Relative Humidity, Calendar (Y/M/D) and Time (clock)
DIGITAL WALL MOUNTABLE/DESKTOP TYPE
WARNING CARBON DIOXIDE LEVEL
ALARM OUTPUT DRIVE RELAY TO CONTROL SYSTEM
Stable NDIR sensor for CO2 concentration, NDIR (Non-Dispersive Infrared) WAVE GUIDE TECHNOLOGY WITH ABC (Automatic Background Calibration)

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8.1

Save 26%

GZAIR

GZAIR Indoor CO2 Meter, Data Logger, Wall Mountable & Tabletop Carbon Dioxide Detector, Air Quality Monitor, NDIR Sensor, Temperature and Relative Humidity, Time & Date, 0~9999ppm Range

26% Off

Main Highlights

NDIR Sensor: This CO2 monitor is equipped with a high-precision NDIR sensor.
Built-in Storage for Data Logging: This device can save 22528 data readings for CO2 concentration/Temperature/Humidity. It also can export data to the PC.
Audible Alarm: Alarm Buzzer will beep when the CO2 concentration level exceeds the upper/lower threshold value.
Power Supply or 3 AAA Batteries Supply: This beautiful portable device is light. It can be easily moved anywhere to monitor air quality.
Flexible Wall-mounted & Table-top Usage: It can stand on the table with a support bracket or mount on the wall for the best possible use of space.

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Best Value

8.1

Save 50%

AMTAST

AMTAST Carbon Dioxide Meter Digital CO2 Monitor 3 in 1 Desktop CO2 Temp. RH Monitor with Data Logger Environmental Controller for Grow Room Green House Factory Office AMT310

50% OffFree Shipping

Main Highlights

This is a 3 in 1 desktop CO2 monitor measures the indoor air quality index, including the CO2, TEMP, and RH. By using Dual Beam NDIR technology, it provides accurate CO2 readings ranging from 0 to 5000 ppm. It has Human and plant modes built in with clear LED screen.
In human mode, this carbon dioxide meter is useful in verifying indoor air quality for home, office, school, restaurant, library, station, or vehicle interior.
In plant mode, this carbon dioxide meter is a guardian for users to control CO2 level in greenhouses or hydroponics to achieve the goal of efficient plant growth and increase yield.
Memory: Digital memory chart shows and records stats over an adjustable 24-hour or 7-day period; The trend chart shows variable Min/Hr/Day/Wk for readings of CO2/RH/Temperature.
Sensor & Alarm: 2-channel low drift NDIR gas sensor and audible alarm for low or high CO2 levels.
Functionality: Features multiple hanging options with the hook-and-loop fastener along the back that attaches to an external battery pack (battery pack not included); Green power supply is compatible with a standard smartphone charger.

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Our Best Overall Choice

Best Choice

9.7

Onset HOBO

Onset HOBO MX1102A Bluetooth Carbon Dioxide, Humidity and Temperature Data Logger

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Integrated Sensors for Carbon Dioxide, Humidity and Temperature Measurements in an Indoor Environment
Wireless Transmission of Recorded Readings to Smartphones or Tablets Using Bluetooth Smart LE Communications
0 to 5000ppm, -20°C to 70°C and 1% to 90% RH Measurement Ranges with a ±50ppm, ±0.21°C and 2% RH Accuracy
(4) User-Replaceable AA Alkaline Batteries with 6 Month Life (5 Minute Sampling Rate)
Includes Command Strip, Double-Sided Tape, Hook & Loop Strap and (4) AA Alkaline Batteries. HOBOmobile App Available on the Apple Store and Google Play

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