If they aren't marked, measuring them is what your stuck with if you wanna know. A tool for that purpose is of course primo..but that not being available, you can use a concoction of weights, bathroom scale and tape measure to arrive at 'X' compression with 'Y' pounds of force.
Never done that...seems a bit of a crap shoot to me. Especially if your trying to sort out .38kg/mm from .40kg/mm!
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