Ideal for either adults or children the highly advanced Microlife® Digital Peak Flow Meter is used to indicate early warning signs for asthmatic attacks. Stores 240 readings with time and date, which can de downloaded to a printer or computer. Measures peak flow and FEV1. Automatic Traffic Light Indicator. Compact and easily fits in the palm of your hand. Includes three mouthpieces and deluxe storage case. Runs on 2 AAA batteries (included).