... the pull of 30-50KG, 50KG will reach the deformation will not pull off, but will not affect the effectiveness and use of light, ... luminescent shoelace pull ,30-50KG,50KG will reach the deformation will not pull off, but will not affect the effectiveness and use of light, ... same6. Metering principles:Because fiber optic light guide, it will receive the impact of ambient light, the test environment ...