Provide a variety of mask testers with high precision and easy to use. It is used to test medical masks, disposal masks, KN / KP 90 / 95 / 100, N / P / R 95 / 99 / 100, FFP 1 / 2 / 3, KF 80 / 94 / 99 dust masks etc. The test indexes include filter efficiency (penetration efficiency), resistance, exhalation resistance, inhalation resistance, leakage air flow of the exhalation valve, difference pressure of medical face mask, mask defects, etc.