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Co2 Monitor Carbon Dioxide Comparison - June 2025
| 1 Best Choice  9.9Exceptional | 2  9.8Exceptional | 3 Best Value  9.7Exceptional |
| View DealOn Amazon | View DealOn Amazon | View DealOn Amazon |
ModelNewentor 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, Black | Model Lunarlipes Portable 4-in-1 Carbon Monoxide Detectors, Mini Carbon Monoxide and Carbon Dioxide Monitor with Magnetic Suction, RV CO CO2 Detector Alarm Temp/Humidity Sensor, CO CO2 Air Quality Monitor | Model 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 |
BrandNewentor | Brand Lunarlipes | Brand U UNNI |
Reviews | Reviews | Reviews |
Available On  | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.9
1NewentorNewentor 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, Black
Why we love it
Accurate CO2 measurements.
Customizable alert settings.
Bright, easy-to-read display.
Main highlights- [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.
- ️ [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.
- [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.
- [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.
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9.8
2Lunarlipes
Lunarlipes Portable 4-in-1 Carbon Monoxide Detectors, Mini Carbon Monoxide and Carbon Dioxide Monitor with Magnetic Suction, RV CO CO2 Detector Alarm Temp/Humidity Sensor, CO CO2 Air Quality Monitor
Main highlights- 【SHOP WITH CONFIDENCE】Your satisfaction is our top priority. We provide 3 years service and lifetime technical support for CO CO2 detector portable. If you encounter any problems, just contact us through Amazon Customer Service or Q&A and we will reply within 12 hours. risk-free shopping. Customer satisfaction is our tireless pursuit.
- 【OUTDOOR LANYARD & MAGNETIC SUCTION】The bottom of the CO CO2 air quality monitor can be placed freely, you can put it on the table in the living room, kitchen, bedroom, etc. And it is equipped with a special outdoor lanyard, which is convenient for you to carry and use in outdoor activities such as travel, camping, picnic, and adventure. There is also a magnetic function on the back of the CO CO2 monitor, which can be attached to any metal area such as home appliances or cars.
- 【LARGE CAPACITY BATTERY & FAST CHARGING】The MINI 4-in-1 CO detector has a built-in 1000mAh lithium battery for long-lasting power. Support QC2.0, PD3.0, AFC, USB C UFP (BC1.2 DCP CDP SDP) and other common fast charging protocols 10~65W charging. When the CO detector is not operated for 5 minutes, it will automatically turn on the energy saving mode (the brightness of the screen will be reduced), and you can click the "function button" to turn on the backlight.
- 【HIGH-PRECISION 4-IN-1 CO DETECTOR】The portable 4-in-1 carbon monoxide detector can monitor the current CO, CO2, temperature and humidity in the air in real time. Equipped with a high-precision sensor (10-year life), the detectable CO concentration range is 0~1000PPM, the CO2 concentration range is 400~5000PPM, and the temperature range is 14~122℉ / -10~50℃, humidity range is 0~95%RH. The data is accurate without delay and monitored in real time.
- 【CO2 LIGHT INDICATION & CUSTOMIZED ALARM VALUE】The carbon dioxide monitor can present a 3-stage light indication according to the CO2 concentration. 400~699PPM (green flashing=safe), 700~1499PPM (yellow flashing=warning), 1500~5000PPM (red flashing=danger). By default, the audio alarm sounds when it reaches 1500PPM. You can double-click the "Function Button" to customize the CO2 concentration alarm threshold. Note: The device must be in the "CO₂" interface before entering the CO2 custom setting.
- 【CO LIGHT INDICATION & CUSTOMIZED ALARM VALUE】The carbon monoxide monitor can present 3-stage light indication based on CO concentration. 0~49PPM (green flashing=safe), 50~99PPM (yellow flashing=warning), 100~1000PPM (red flashing=danger). By default, the CO monitor will sound an alarm when it reaches 50PPM. You can double-click the "function button" to customize the CO concentration alarm threshold. Note: The device must be in the "CO" interface before entering CO custom settings.
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9.7
3U UNNI33% Off
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
Why we love it
Real-time CO2 monitoring.
Adjustable alarm and backlight settings.
High-precision Swiss sensor.
Main highlights- 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.
- 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.
- 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!
- 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.
- 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 %.
- 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.
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