Method of fishing net quality appraisal: First, check the smoothness, resilience and softness of the line by hand, and observe the transparency of the line in the light. The diameter and tension of the second measuring line. If the diameter and pulling force are not different from those specified in this label, the line diameter is not more than 10% positive and the pulling force is not more than 10% negative, the line is acceptable. Thirdly, we should use our hands and eyes to check the surface of the fishing line for hard injuries and scars. Fourth pull one pull to see how resilient it is. Aging and hardening. Injurious, inelastic and aging nylon fishing line should not be used.