Test Results:

1.031 A Mooshim-Python times 8
1.000 A multimeter gelb (Pollin PDMM-390)
0.9975A multimeter orange (Keysight U1232A)

12.404 V Mooshim-Python
12.06 V multimeter gelb (Pollin PDMM-390)
12.00 V multimeter orange (Keysight U1232A)

Seems like I still have an calibration issue with the voltage, but at least it’s reasonable values :)

I forgot to include the Android measurements, so I briefly repeated them:
1.034 A Mooshim-Current times 8
1.0011 A Mooshim-Android
0.9975 A multimeter orange (Keysight U1232A)

12.404 V Mooshim-Python
12.0070 V Mooshim-Android
12.00 V multimeter orange (Keysight U1232A)

Guess I should also dig into the Android code and port the conversion from there…

Feel free to watch my progress with the project at
https://github.com/nefarius2001
(though it might take some days to have a well working state uploaded)