Any recommendations for a good portable CO2 monitor?

> "Connect your device to the app to view, track and analyze your data from the last 7 days"

In a time where gigabytes are trivial (megabytes is enough for hundred thousands of measurements anyway here), why do such limitations like "7 days" still exist?

If there's a way to get a CSV or similar file you can analyze on any device you want, then we're talking

There's several Python scripts that can pull the data over Bluetooth.

https://github.com/stijnstijn/pyaranet4

https://github.com/Anrijs/Aranet4-Python