This ultrasonic flowmeter is a handheld measurement system which is easy to install and use. It functions based on the difference in the transit time of flight measured, and also establishes the flow ...

A peak flow meter is a portable handheld device used to measure how well a person with asthma can blow air out of the lungs. (Asthma narrows the airways, making breathing difficult.) The person blows ...

Results 10 studies were included. 8 assessed screening questionnaires (the COPD Diagnostic Questionnaire (CDQ) was the most evaluated, n=4), 4 assessed handheld flow meters (eg, COPD-6) and 1 assessed ...