Yes stepper motor pumps can be more expensive but may be not that much compared to another pump that would be as accurate. And as skybound mentioned it is possible to assemble a stepper motor with a peristaltic head for not too much.
But you are right, the question is whether a “normal” pump can be accurate enough for our needs. The fact that skybound measured different volumes on each of its pumps would tend to show that this is not the case (at least for this type of pumps).
2 Likes