This easy to use, precise USB Lung Monitor is designed to record key lung function parameters for those with chronic respiratory conditions. This device helps a multitude of patients including those with cystic fibrosis and transplant patients. This monitor can be used as a home monitor due to its simple use setup and large, easy to read display. The Lung Monitor Measures FEV1, FEV6 and the ratio and Displays % of Personal Best FEV1. Color zones are then set to the personal best FEV1. The USB version ads the capability of computerized printed and exportable trend reports using Vitalograph Reports. These can also be downloaded to Spirotrac V software. This version also adds the FEF25-75% measurement to reports and downloaded data. This is an excellent product for post-transplant home recovery patients.