Test items: Measurement of pressure difference of mask gas exchange The DRK371 medical mask gas exchange pressure difference tester is used to measure the gas exchange pressure difference of medical surgical masks and other products. The DRK371 medical mask gas exchange pressure difference tester is used to measure the gas exchange pressure difference of medical surgical masks and other products. Standards Compliant: YY 0469-2011 medical surgical masks 5.7 pressure difference; YY/T 0969-2013 disposable medical masks 5.6 ventilation resistance and other standards. Features: 1. Color touch screen display operation, Chinese and English interface, menu operation mode. 2. Imported pressure sensor. Instrument parameters: 1. Display and control: color touch screen display and operation, parallel metal button operation; 2. Air source: 0.35～0.8MP; 30L/min; 3. Pressure difference (ventilation resistance) measuring range: (0～100) Pa/cm2; accuracy is ±2%; 4. Test air flow: (8±0.2) L/min; 5. Sealing method: O-ring seal; 6. Differential pressure sensing range: 0～500Pa, with an accuracy of 1Pa; 7. The breathable diameter of the sample is Φ25mm, and the test area is 4.9cm2 8. Data output: automatic storage or printing; 9. External dimensions (L×W×H): 560mm×420mm×380mm; 10. Power supply: AC220V, 50Hz, 200W; 11. Weight: about 30kg;