The MoreSense CO2 is great metering tool
For MoreSense CO2 sensor for Home Assistant/Homey etc.
I got the contact from the maker quickly after ordering and the product itself is well made and easy to use as a display. Also the data can be pushed to MQTT or pulled with HTTP GET. The HTTP GET was easy to setup into Home Assistant as there is example resource.
The maker was super helpful when I had some tinfoil hat problems with my wifi password and we got things sorted out even I made a mess while trying it.
Truly Amazing 5/5 experience altogether with the unparalleled support