How do fishing line manufacturers test for the weight and strength

How do fishing line manufacturers test for the weight and strength of their line? - Quora

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250lb - 600lb Quality Monofilament Fishing Leader/Speargun Line Made in The USA (Choose Diameter)

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How do fishing line manufacturers test for the weight and strength of their line? - Quora

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Why do some cheap mono fishing lines claim to be so strong while