Vitalograph asma-1 Respiratory Monitor usbThe Vitalograph asma 1 is a simple to use electronic peak flow meter that measures PEF and FEV1. Measures PEF and FEV1 FEV1 has less diurnal variability and is less effort dependent than PEF Displays % of personal best for both PEF and FEV1 PEF and FEV1 zones can be personalised Automatically assesses test quality Automatically stores best values Large, easy to read display Stores 600 test sessions Suitable for use in clinic with SafeTway mouthpieces