To measure grain weight of a fly line (in grains per foot), simply weight it on a scale and divide by its length. The segment of fly line shown below is 9 feet long, weighs 103.2 gains, and thus weighs 11.5 grains per foot. The accuracy of this measurement is limited only by the accuracy of the scale, which in this case is 0.15 grains / 103.2 grains = 0.15%.
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