The gas detector PCE-AQD 10 is used to measure air quality. The gas detector measures carbon dioxide, temperature and humidity. The CO2 sensor from the gas detector is disconnected from the main unit with a connection cable. - Measuring range: 0 … 4000 ppm - Measuring range: 10 … 90% rh - Measuring range: 0 … 50C / 32 … 122F - Memory on SD card - 3 parameters of air quality - CO2, air temperature and humidity