Range: 60-900L/min (EU Scale0  Scale Increment: 10 L/min  Accuracy: +/-55 OR 10l/min  Repeatability: +/-2%  Calibration: 100% (individual unit)  Frequency response: 100Hz@350L/min  Dynamic State: Critically damped @350L/min  Standard Compliance: EN13826s AS/NZS 4237:1994 NAEP Guidelines 1991  PEF measurement is an important Lung Function Test to check for airways obstruction and treat Asthma effectively  Resolution : 480 x 272  It can be carried out in a clinic or at home