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Read our primer articles on Oil Analysis and Tribology

There are different sizes for different viscosity ranges. We use three different sizes in our visocometer. I do not know the internal diameter to the orifice.

Our viscometer used gravity to measure how long it takes the oil to get from point A to point B. A simple formula is used to turn the time it takes to go from point A to B into viscosity. That is the test in a nut shell. There is quite a bit more to the testing process but, I won't bore you with the details.
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