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Main PerformanceMeasure Forced Vital Capacity (FVC).Measure Forced Expired Volume in one second (FEV1), the ratio of FEV1 and FVC (FEV1%), and the testee condition can be shown by the ratio.Peak expiratory flow (PEF), 25% flow of the FVC (FEF25), 75% flow of the FVC (FEF75) and average flow between 25% and 75% of the FVC (FEF2575) can be measured.Flow rate-volume chart, volume-time chart display.Battery power display.Automatic power off when there is no operation in one minute.Data memory function.Data memory, delete, upload and review.Rechargeable lithium battery.Main ParametersMax volume: 0L~10LFlow range: 1L/S~16L/SVolume accuracy: ±3% or 0.05L (whichever is greater)Flow accuracy: ±10% or 0.3L/s (whichever is greater)EMC: Group I Class B.The type of protection against electroshock: Internally powered equipment.The degree of protection against electroshock: Type BF applied part.
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