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Spirometer is a hand-held equipment for checking lung conditions, adopts the infrared mode for measuring relative items, and is applicable for hospital, clinic for routine test. Features: High resolution color LCD. Fvc, fevi pef fev 1 %, fee25, fef75, fef2575 can be measured. Display of waveform and trend chart. Display of the testee's health condition. Measurement data can be stored, deleted, uploaded and reviewed. Scaling (calibration) clock function auto power- off. Rechargeable lithium battery, with power indication. Dimension : 97mm (L) x 89mm (W) x 36mm (H).