I am trying to make a tds meter (total dissolved solids)

I am trying to make a tds meter (total dissolved solids)

There are two similar sketches.
One for calibration and one for measurement.

Seperate names but the IDE has ideas of it’s own.

Save options seem to be confusing .

Does anyone else have this problem ??

What problem exactly?

Saving one sketch seems to affect the other. Using the (save as) option tells me that i cannot put it on top of itself. I will try to explain this better when i can sit down and do it more methodically.

Long day and i should have thought this through before posting, although i have had similar problems before.