MiniMon
Read and Log CO2, Temperature, and Humidity from a CO2 Monitor Device
...MiniMon in its current form runs on Linux, using the default HIDRAW driver, but can be adapted to other operating systems, where such a driver is available.
Example output in a normal office setting:
CO2: 501 ppm, T: 26.29 °C
CO2: 502 ppm, T: 26.29 °C
After exhaling towards the device, you may find this output, while the display on the device itself (limited to 3000ppm) only shows 'Hi' with the red LED on:
CO2: 9723 ppm, T: 26.85 °C
CO2: 7824 ppm, T: 26.85