... testing equipment, such as laser measuring Caliper (accuracy: 0.0001 mm), digital computer tension (strength) test machine, water, intrinsic viscosity ... of the standard environment.1.3 instrumentation: blast-type incubator (0 °C ~ 300 °C) ± 1 °C, 1000 mm steel ruler, ... micrometer (precision 0.001) or laser diameter measurement, electronic strength tester ...