Accuracy of Spircare Device as Compared to the Conventional Plethysmograph

Inclusion Criteria: 1. Signed Informed consent. 2. Age≥18 year. 3. Subject is cooperative and capable of following instructions. 4. Phase I: Healthy asymptomatic subjects, never smokers without known history of respiratory, cardiovascular, hepatic, renal or metabolic disease. 5. Phase II: Chronic pulmonary patients with lung volume disorders: * COPD * Asthma * Restrictive diseases such as pulmonary fibrosis, other interstitial lung diseases, kyphoscoliosis, neuro-muscular disorders. Exclusion Criteria: 1. Subjects unable or unwilling to give informed consent. 2. Subjects who are unable to satisfactorily perform routine, full lung function testing (due to non-compliance or claustrophobia). 3. History suggesting upper respiratory infection during the four weeks prior to testing 4. Physical activity during 1 hour prior to the Study. 5. Patients with a tracheostomy. 6. Pregnant women.