Please explain what is Grist and how does it work to measure Soft cylindrical material's diameter?

Please help me letting know what is GRIST? How does it work to measure the cylindrical soft material's diameter e.g. cylindrical cord(made of yarn).please show one picture of this tool also. hoping for sooner reply.Thanking you in advance!
ashutoshdwivedi
Asked Jan 29, 2014

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