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Digital Air Permeability Tester is mainly used to test the permeability of various fabrics, special industrial fabrics, general fabrics, knitted fabrics, coated fabrics, non-woven fabrics, tuning paper, industrial filter paper and other related materials: 1. Check before Air Permeability Tester starts 1) Check whether the power plug of the main unit is firmly inserted. 2) Check whether the air sup...