LISUN produce the bfe tester for face mask, pfe tester, melt-blown cloth electrostatic electret generator according to ASTM F1862-17, ASTM F2299-03 (2017), ASTM F2100-2019, BS EN14683-2019, BS EN 14387-2004+A1 2008, BS EN 136-1998, BS EN 140-1999, BS EN 143-2000 +C1-A1, BS EN 149-2001+A1