Please double check the CO sensor, I believe the measurement range for the SPEC-Sensors CO devices is ppm. Down to 1ppm (which is normal background value), with resolution of 0.5ppm
The python libraries have it in ppb. That's perhaps valid for the NO2 SPEC-SENSOR, but probably a copy and paste error for the CO sensor.
Please double check the CO sensor, I believe the measurement range for the SPEC-Sensors CO devices is ppm. Down to 1ppm (which is normal background value), with resolution of 0.5ppm
The python libraries have it in ppb. That's perhaps valid for the NO2 SPEC-SENSOR, but probably a copy and paste error for the CO sensor.