https://www.lanequalitys.com/products/dm1305-co2-meter.html This device serves as an air quality monitor, capable of detecting Carbon Dioxide (CO2), Temperature, and Humidity. It integrates sensors to provide real-time monitoring of CO2 levels, temperature, and humidity, displaying the data directly on its screen. Features of DM1305 carbon dioxide flow meter MINI CO2 Meter; LED Screen display; CO2 Technology : infrared ( NDIR); Temperature, Humidity, CO2 Alarm function; Specification of DM1305 co2 flow meter Temperature unit Celcius or Fahrenheit 24 hours real time monitoring