THIS IS A NEW TESTER - STILL SEALED - NEVER USED. THE VENTILATOR TEST SYSTEM IS BATTERY-OPERATED, HIGH AND LOW FLOW ANALYZERS THAT CAN ALSO TEST MANY VARIETIES OF MEDICAL EQUIPMENT (ex:); ANESTHESIA GAS DELIVERY MACHINES, INSUFFLATORS AND OXYGEN CONCENTRATORS. THE COMPACT SIZE MAKES THIS VENTILATOR TESTER IDEAL FOR USE IN FIELD SERVICE, BIOMEDICAL SHOPS, MANUFACTURING. THIS SYSTEM IS DESIGNED TO MEASURE GAS FLOW AND PRESSURE IN INSTITUTIONAL, HOME CARE, FIELD SERVICE, LABORATORY, AND MANUFACTURING APPLICATIONS. SOME FEATURES ARE: Flow, Peak Flow, Volume, Stacked Volume, Minute Volume, Inspiratory Time, I:E Ratio, Respiratory Rate, Pressure, Peak and PEEP Pressure, Barometric Pressure.