After using a plastic Zahn cup for a while, I suspect that a small amount of residue in the outlet hole will change the timing on the cup. Does anybody know how long it takes for clear water to empty from a new one of the popular plastic cups?
Cup Number Seconds Range Centistoke Range Midrange Sensitivity¹
Calibration Oil Number²
1 40 to 60 10 to 36 1.3 G-10/19
2 20 to 60 19 to 156 3.3 G-60/117
3 12 to 60 64 to 596 10.5 G-200/458
4 10 to 60 79 to 784 13.9 G-200/458
5 10 to 60 161 to 1401 24.2 G-350/878
¹ Stated as centistokes per second of efflux time.
² Centistoke values are nominal - actual values printed on labels
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