Multifunction air quality monitor — measures CO2, formaldehyde (HCHO), temperature, humidity, and more, with an easytoread LCD display and simple controls. Practical for home, office, or travel. Key benefits Know your air quality instantly: The builtin LCD provides immediate readings so you can identify problems and take action without delay. Detect invisible hazards: CO2 and formaldehyde readings help reveal poor ventilation or chemical exposure that you can't see or smell. Easy to use anywhere: Simple controls and a portable form factor make monitoring straightforward at home, at work, or on the road. Make better decisions about ventilation and comfort: Temperature and humidity data let you tune HVAC or dehumidifiers for healthier indoor conditions. What it does (functions) Measures CO2 levels to indicate ventilation quality Detects formaldehyde (HCHO), a common indoor pollutant Reports temperature and humidity for comfort and moldprevention decisions Provides instant visual feedback on current readings via LCD Who it's for Homeowners who want to check bedrooms, living rooms, or nurseries for unsafe air and maintain comfortable humidity and temperature Office managers verifying meetingroom ventilation or shared workspace conditions Travelers checking air quality in hotel rooms, rental apartments, or temporary accommodations Practical use examples Bedroom: Check CO2 and humidity before sleep to improve air comfort and reduce nighttime stuffiness. Office or school meeting room: Verify CO2 levels during gatherings to decide when to increase ventilation. Travel and stays: Quickly test hotel or rental rooms for formaldehyde or poor ventilation before unpacking. Why it stands out Delivers multiple key airquality measurements in one device LCD display and simple controls make readings clear and actionable Designed for everyday use in homes, offices, and while traveling Simple to operate, informative to read, and useful wherever you need reliable indoor air information.