Advanced Ndir Sensor Technology : Accurately And Quickly Detect Co2 Levels In Any Environment. When Co2 Concentration Exceeds A Certain Value, An Audible Alert Will Sound, Ensuring Your Safety And Health. Portable Co2 Monitor : Compact Size And Rechargeable Battery Make This Device Ideal For Monitoring Air Quality In Various Settings Such As Homes, Offices, Schools, And During Travel. Multi-Purpose Usage : Suitable For Monitoring Co2 Levels In Multiple Environments Including Homes, Offices, Schools, Tourism Areas, Agricultural Settings, And Industrial Spaces. Lcd Display : Clearly Shows Readings Of Co2 Levels, Temperature, And Humidity, Making It Easy To Keep Track Of Environmental Conditions. Customer Satisfaction Guaranteed : Contact Us For Any Questions Or Concerns, And We Will Provide Prompt And Professional Assistance. Immerse yourself in the essence of precision and convenience with our 3-in-1 Air Quality Tester. Perfect for your daily adventures, this sleek device seamlessly integrates NDIR Sensor Technology, offering unparalleled accuracy in monitoring CO2 levels, temperature, and humidity. Its compact size makes it an ideal companion for travelers and professionals alike, ensuring you breathe easy no matter where your journey takes you. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store