Air Quality Monitor, Indoor CO2 Meter, Accurate Air Quality Detector for CO2 HCHO TVOC/AQI for Home Office, Real Time… Price: 49.99 (as of 01:16 EST- More info)

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5 IN 1 MULTI-FUNCTIONAL DETECTOR: Know your air- Upgraded indoor air quality monitor built in DART electrochemical sensors that can accurate detect air of Carbon Dioxide(CO2), Formaldehyde(HCHO), Volatile Organic Compounds(TVOC).
5.5 INCH & REAL TIME LED SCREEN DISPLAY: Large screen display makes it easier to read data, which shows clearly real time CO, CO2, HCHO,TVOC, AQI of five indicators. The battery displays three color states: green, orange, and red. Green indicates sufficient power. Orange indicates half of the battery. Red indicates insufficient power(Need charge it in time).