Handheld Spirometer with USB SpiOx Lite is a hand-held Spirometer for checking lung conditions, adopts the mode of infrared interruption for measuring FVC (Forced Vital Capacity) , VC (Vital Capacity) , MVV (Maximal Voluntary Ventilation) and relative parameters, and it is applicable for hospital, clinic for routine test. SpiOx Lite Functions Measure the relative functions of FVC, VC and MVV, display and analyse thirty-three parameters, and display the optimal value from many measurements. Besides, the user condition c an be shown by the ratio of the measured value and the predicted value. Real-time display respiration waveform: flow-volume loop and volume-time curve chart. Display test time and environment temperature. Trend chart display, which provides the trend of each parameter within a period for the user. Calibration function to ensure the test accuracy. Power and test indicated. Performance Volume accuracy: ¡À3% or ¡À0.05L (whichever is greater) Flow range: 1 L/S ~16L/S Flow accuracy: ¡À10% or ¡À0.3L/s(whichever is greater) Working current: ¡Ü50mA Power supply: supplied power by USB Safety classification: class equipment, type BF applied part