The SPIROMETER is a wireless hand-held equipment used at medical facilities/ clinics / at home for checking lung conditions. Some of its main features include: Forced Vital Capacity (FVC), Forced Expired Volume in one second (FEV1), caplable of measuring the ratio of FEV1 and FVC (FEV1%) and Peak expiratory flow (PEF), 25% flow of the FVC (FEF25), 75% flow of the FVC(FEF75), etc. It displays trend curve and scaling (calibration). An information prompt appears when volume or flow goes beyond the limit. It has an automatic power off when unused for 1 minute and comes with a rechargeable lithium battery.