Blog, News Chronic Obstructive Pulmonary Disease (COPD) and Asthma November 4, 2019 Posted by J A 04 Nov Peak flow meters: A peak flow meter is a small device that measures the amount of breath a person can exhale in one forced breath. Nebulizers: A nebulizer turns liquid medicine into a very fine mist that a person can inhale through a face mask or mouthpiece. Face Masks/ Mouthpiece: A nebulizer turns liquid medicine into a very fine mist that a person can inhale through a face mask or mouthpiece.