Yeah, I meant the manometer tube. Doesn't really matter what diameter it is. Though smaller will generally work better as it requires a much smaller volume of water (therefore less change in the surface of your reservoir, it'll reach equilibrium faster...). I think we used 1/16" ID tubing for the manometers in the permeability cell at school.
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Michael E. Robbins
M.A.Sc. Candidate, University of Toronto
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