Medical Adult Portable Spirometer Peak Flow Meter Speed Meter Expiratory Flow for Lung Asthma Breath Function Monitor

1. Material: recyclable ABS plastic-
2. Accuracy: +/- 10L/min Or +/- 10%of the reading-
3. Repeatability: +/- 5L/min Or +/- 5%of the reading-
4. Altitude effects on the peak flow meter: Lowers reading by approx. 5% per 1000m, decreased air density increases PEF by approx. 5% per 1000m.-
5. Highest resistance to flow: 0.00384kPa/L/min @ 720 L/min- Measurement range: 50-800 L/min BTPS- Storage Condition: Temperature 10-35 Celsius, relative humidity 30%-75%-
6. Frequency response: Profile A/B difference less than 15 L/min/15%