Chronic obstructive pulmonary disease (COPD) is characterised by increasing breathlessness. In the early stages of the disease, the symptoms are unnoticed. The symptoms are seen in the more developed stages of the disease. Hence it is important for us to develop an easy to use device for diagnosis. The proposed device solves the purpose of primary diagnosis of COPD, which enables the patient to do a self-test of his lungs capacity. The sensor system of the device includes a rotary sensor which enables the patient to have precise and accurate information every time. The device has a modern and interactive application which gives the patient access to a detailed report on his lungs condition. The application also features exercise mode in which the patient can do simple breathing exercises to prevent and treat chronic obstructive pulmonary disease in the early stage. The device has been tested with 87% accuracy. © 2019 Inderscience Enterprises Ltd.