T21 is a sensor for measuring carbon dioxide, CO2, Eco2, total volatile organic compounds (TVOC), air quality, temperature and humidity, used as a replacement for CCS811 for Arduino

The Ens160 digital multi-gas sensor is specially designed for indoor air quality monitoring. This sensor is used in home and building automation, consumer products, electrical appliances and air purification systems. It can detect reducing and oxidizing gases and supports up to four independent gas sensors, including integrated measurement and heating drive control. An integrated set of pre-calibrated sensors and an automatic baseline tuning algorithm. Provides a variety of indoor air quality metrics, including total volatile organic compounds, equivalent carbon dioxide and air quality level. It features a 12C and SPI communication interface, requires less than 1 minute to warm up and is completed within an hour to install. Strong resistance to siloxane and moisture