Rod weights

Question
I have an "Action Rod GBG-C Tubular #2086 Glass" Fly rod and I'm trying to find what weight it is? It's 8' 6" long and fiberglass. The rod weighs 6 ounces. There's not much info on the label. And is there a way to test#?# for a rods weight? Cause I have an old Herter's Fly rod with no markings I'd like to find the weight on as well. I picked these up to learn how to fly fish. I like the way they feel. But, I'd like to upgrade the year production for my rods :) Thank you very much for your time and expertise. And, if pictures will help I can send them?
Thanks again,
Bryan

Answer
Bryan,
GBG-C is the line weight.
found this chart on line years ago and my experience confirms it.
AFTMA #   DT   WF          LEVEL   MM - OD   IN - OD
1   --   --       I   0.56   .022
2   --   --       H   0.63   .025
3   IFI   IFG       G   0.76   .030
4   HFH   HFG       F   0.89   .035
5   HEH   HEG       E   1.02   .040
6   HDH   HDG       D   1.14   .045
7   HCH   HCF       C   1.27   .050
8   GBG   GBF       B   1.40   .055
9   GAG   GAF       A   1.52   .060
10   G2AG   G2AF       2A   1.65   .066
11   G3AG   G3AF       3A   1.78   .070
12   G4AG   G4AF       4A   1.91   .073
your line is  7-8 weight in modern terms


There is a way to test for line weight - you have reels with 3 to 8 weight line on each  and then you try it out to see if it preforms properly. But you need to know how to cst erll as well as feel what the rod is doing with the line.

Like today most rods were 6 weight in the good old days.