6-in-1 carbon dioxide CO2 meter: multifunctional CO2 meter room air that can help you detect air quality by testing CO2, CO, PM2.5, PM10, HCHO, TVCO, temperature and airiness.High accuracy: carbon monoxide detector uses high-precision laser sensors and laser particle sensors with stable performance and strong interference protection ability and can accurately capture different data. Built-in battery, USB charging support, with power indicator light, can be charged in time when the battery is low. The battery icon flashes when charging and no longer flashes when fully charged.LED display screen: CO2 meter indoor air uses high-quality LED four-colour screens, which can be divided into different air quality levels based on the values of different indicators, so you can intuitively see the air quality from the colour.[Timely Reminder] Air quality monitor warns you about changes in air quality due to colour changes.Wide application: the CO2 detector is suitable for monitoring air quality in homes, schools, office buildings, hospitals, restaurants, shopping malls, factories, hotels, laboratories, etc.