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An easy solution (sorry) is to make a graph using control batches of different percentage concentrations and then in future you can compare refractometer reading to concentration.

I did some custom code for a Duplomatic on Arduino - heres a vid of it on a 'bench' - the connectors simulate what the duplomatic would be doing.


https://www.youtube.com/watch?v=pReSONQNLQo
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Thanks for the heads-up on Etcher Paul, I used this and the iso booted first time.

My jitter readings are crazy high with my Dell. Going to try with external graphics and see where that get me...

I don't know if you have tried the linuxcnc forum - but I've always found them really helpful
https://forum.linuxcnc.org/

Best advice I heard recently was Kingspan or similar - a better structure than polystyrene (okay, the dust will kill you - but that's better than the polystyrene balls electrostatically sticking to...

It's best to start with considering the mechanics.
Do you want to run the standard screws, or convert to ball screws?
Then you need to think about mounting the motors, and if you'll need to gear...