Peak Flow Master Device 1 is used for measuring Peak Expiratory Flow (PEF), providing insights into how well air moves through your lungs. This helps in assessing airway obstruction levels. This device can reveal changes in lung function before symptoms appear, allowing for timely intervention in conditions like asthma. Its portable and straightforward design makes it easy for both adults and children to use at home or on the go. By tracking PEF readings, users can follow personalised asthma action plans, adjusting medications as needed based on their measurements. The device provides instant readings, enabling users to make quick decisions about their respiratory health and treatment options.