Functions:
Forced Vital Capacity (FVC), forced expiratory volume in one second (FEV1) to forced vital capacity (FVC) ratio (FEV1/FVC), peak expiratory flow (PEF), forced expiratory flow at 25% of FVC (FEF25), forced expiratory flow at 50% of FVC (FEF50), forced expiratory flow at 75% of FVC (FEF75) and forced expiratory flow from 25%~75% of FVC (FEF2575) can be measured.
Personal information (including height, age, gender, etc.) can be set.
Flow-volume chart and volume-time chart display.
Data can be stored, deleted, uploaded and reviewed.
Trend graph display.
Health status indication.
Calibration function.
Overflow indication function for volume and flow.
Exhalation indication within 6 seconds.
One-button start of measurement.

1. User information setting.
2. Case evaluation function.
3. Bulk case storage: up to 9999 cases can be stored.
4. Exhalation time indication function.
5. Data transfer via Bluetooth and USB.
6. Calibration function to ensure test accuracy.
7. Power supply indicator and test indicator light.

Accessories
1. User manual
2. USB data cable
3. Chuck
4. PC software
5. Power supply (optional)
6. Nose clip (optional)

Technical features:
Display: 2.8" LCD
Volume range: 0 ~ 10 L
Volume accuracy: ± 3 % or ± 0.05 L (whichever is greater)
Flow rate range: 0 L/s ~ 16 L/s
Flow accuracy: ± 5 % or ± 0,2 L/s (whichever is greater)
Operating current: 200 mA
Power supply: rechargeable lithium battery