Have you been able to confirm real world things, like CO2 fluctuations between day and night in your low tech tank?
I'd have to write an app to log the data which wouldn't be hard. I wouldn't be interested looking at numbers all day long
Actually, I just finished up a project and will have time to write up an app.
I have confirmed different CO2 levels in different tanks.
1. tub of tap water - 4.6 ppm
2. low tech in the morning - 20.18 ppm
3. hi-tech at peak levels (afternoon) - 44.01 ppm