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YY-1140 RESPIRATORY RESISTANCE TESTER, FLOWMETER RANGE 0 L/MIN~100L/MIN, FLOWMETER RANGE ACCURACY ±2% DETAILS: THE RESPIRATORY RESISTANCE TESTER IS SUITABLE FOR DETERMINING THE INHALATION RESISTANCE AND EXHALATION RESISTANCE OF RESPIRATORS AND MASK PROTECTIVE PRODUCTS UNDER SPECIFIED CONDITIONS, AND FOR THE RELATED TESTING AND INSPECTION OF COMMON MASK PRODUCTS BY MANUFACTURERS OF NATIONAL LABOR PROTECTION ARTICLE INSPECTION AGENCIES. STANDARD: GB2626-2006,GB/T32610-2016. Learn More