Peak Flow Meter is a simple and inexpensive medical device that can be used to manage asthma. The meter is designed to measure air flow, identifying peak air flow as you exhale. The Peak Flow Meter is important to help a patient identify peak air exhalations and give a patient feedback. This information can be used to help understand and manage their condition in a better way. The Peak Flow Meter measures exhalations and the rate at which air is expelled from the patient's lung. Useful for ages 5 and up See through housing Comes with accessories including nasal clamp and two mouthpieces Designed to be ergonomic and portable.