Best CO2 Monitors Under $100
You do not need to spend hundreds of dollars to get a reliable CO2 monitor. Several excellent options exist under $100 that use genuine NDIR sensors, which is the gold standard for accurate CO2 measurement. These budget monitors are ideal for anyone who wants to track ventilation quality at home or in a small office without breaking the bank. While they may lack advanced features like WiFi connectivity or multi-pollutant sensing, they deliver the core CO2 readings you need to maintain healthy indoor air. We have tested and compared the most popular sub-$100 options to help you pick the right one.
Ecowitt WH45
AcuRite Indoor Air Quality Monitor
PJRC CO2 Gadget DIY Kit
Vson WP6912
INKBIRD CO2 Monitor
Seben HT-2000
Qingping Air Monitor Lite
Sensirion SCD41 Eval Kit
Thirdreality Smart CO2 Sensor
GZAIR Model A
Yeelight YLCG01YL CO2 Sensor
INKBIRD IAM-T1
GZAIR Model B
Pyle PACO2
Temtop M10
ThermoPro TP-65A CO2
Technoline WL1030
Kidde Nighthawk CO2 Monitor
TFA Dostmann AirCO2ntrol Mini
Buying Tips: Best CO2 Monitors Under $100
- 1
Make sure the monitor uses an NDIR sensor, not a cheaper eCO2 (estimated CO2) sensor that calculates CO2 from VOC levels and is far less accurate.
- 2
A built-in display is almost essential at this price range since most budget monitors lack app connectivity, so the screen is your only way to read data.
- 3
Check whether the device needs a USB power source or runs on batteries. Battery-free options are fine for stationary desk use but limit portability.
- 4
Look for monitors that show temperature and humidity alongside CO2, giving you a more complete picture of your indoor environment at no extra cost.