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IAQ MINI CO2 Monitor

RAD-0302 IAQ MINI CO2 Monitor l CO2Meter
Regular price $39.99 Sale price

Compare at $109.00

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**Please Note: All RAD-0302 sales are final**

The IAQ Mini CO2 Monitor is a low-cost, easy-to-use, desktop indoor air quality device for indoor air environments such as homes, offices, conference rooms, classrooms, and many others. It displays real-time CO2 measurements and includes a 3-color LED backlight (green/yellow/red) which gradually changes color dependent upon CO2 concentration level.


  • EASY TO USE: Just power ON and gain real-time CO2, Temp, and %RH 
  • EDUCATION: 3 emoticons quickly indicate the status of when to ventilate
  • ECO SAVING : Includes saving power function to darken the LCD during periods
  • FRESH: Easy, Air Self-Calibration


This device will NOT meet requirements for CO2 safety monitoring which requires a Fixed/Wall mounted, hard-wired alarm per the NBIC, NFPA, or IFC regulations. Refer to our CO2 Safety Products page for devices that meet your needs.

Call us at (877) 678-4259 toll-free or email us to speak with our technical sales team about purchasing the correct device.


  • CO2 Measurement Range: 0-9,999ppm
  • Accuracy: 0-3,000ppm ± 100ppm or ± 7% of reading
  • Display Resolution: 1ppm
  • Warm-Up Time: 10 sec
  • Response Time: 1 min. 
  • Temperature Range: 0°C to 50°C (32°F to 122°F)
  • Accuracy: ±1°C (±2°F)
  • Humidity Range: 0-95% RH non-condensing 0%~99%
  • Power Supply: USB Cable or 5 VDC from an external AC/DC adapter which is not included in the package (Please use a standard USB power supply
  • DC Output Voltage: 5VDC/ >300mA
  • Sensor Life Expectancy: 15 years

  • Data Sheets

  • Manuals

  • Technical Documents

  • Videos

  • Additional Resources

  • Case Studies

Customer Reviews

Based on 10 reviews
Stephen Glover
Very Accurate!

This device is working exactly as I expected. It's extremely accurate for being such a small device.

We're looking ALOT better!

Since we purchased the RAD-0302 our CO2 in the office originally was ~2000ppm. After using the device and ventilating our space we are at 900ppm. Much better! Thanks CO2Meter.

Perfect for our purposes

We have two adult daughters who do not live with us and are at increased risk from Covid-19. We always open windows and try not to sit too close together and wear masks sometimes when they visit us. We bought the IAQ Mini CO2 monitor to learn if our efforts were having the desired effect in terms of air circulation. Turns out we're doing great; in fact, we don't need to open quite as many windows. The monitor is very easy to use. We especially like the color coded screen that lets us know right away, even from across a room, if we're getting into riskier territory. This is no guarantee, of course, but it's very helpful to let us see if air is circulating well in the room, which is an important factor in preventing Covid spread.

Good, could be great

Pro: Reasonably priced given CO2 sensors seem fairly costly. Responsive. Temp/RH seem fairy accurate as well and it is nice having them on the screen.

Pro: Graph is nice, I wish they did it as 24 smaller bars so I could see the effects of exercising for any hour historically vs the -3, -6, -12, -18, -24 which quickly hide an hours worth of high CO2 values, but good enough for broad trending.

Con: Screen viewing angle is terrible vertically, can't have it up on a shelf because you can't see it. Can still see the colors but that is very broad data vs the actual numbers and graph.

Minor Nit: History data is all lost if you unplug it. It is a tiny amount of data and seems like it would be super cheap to add the tiny bit of persistent memory to keep it around.

The best type CO2 monitor at the computer desk

This unit help me see, that my co2 level at my desk at home was too hi. And my humidity was too low at 11%.
Low humidity makes a house feel cooler. Cooking in oven on a gas stove makes a lot of CO2. Now I can control it.

"Easy to install, easy to set up, and easy calibration - just what I was looking for."

- Phillip Farrar
Water Plant Superintendent

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