On Mar 23, 4:57 pm, "Larry L" wrote:
Don't think so .... trying it on a rod is very accurate though ... if you
like it on a 5, it's a 5, .... if on a 6 it's a 6 etc etc

Conversely, my absolutely very first intro to fly rods was an old FG
rod of undetermined weight. The shop owner gauged the flex, lined it
with a shop reel & went out back to cast it. Yup. 6wt.

Joe F.