Other than the obvious there is a gizmo called a "defection board". I've not seen one in many years but it is a huge (perhaps 4 X 8') board with a devise to hold the rod handle on one side and graduated markings on the other. A specific amount of weight is applied to the rod tip. The rods line weight is determined by what marking the weight takes the rod tip to.
On some old rods the line weight is designated by letters instead of actual line weight markings. Check to be sure there is not a 3 or more letter marking somewhere on the lower part of the rod. Here is a conversion table
http://www.orvis.com/intro.aspx?subject=2875
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