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The manufacture's calibration for these flow meters is shown here. It is nonlinear as you can see. So, going from ~40 mm to >65 mm more than doubles the flow rate: it is well over 100 cc/min.
Scale reading Flow Rate
(mm) (cc/min)
---------------------- --------------
65 104.0
60 91.5
55 79.5
50 69.0
45 59.2
40 49.5
35 41.7
30 34.2
25 27.7
20 22.0
15 17.5
10 13.4
5 10.0
Regards,
Don