Medical devices for measuring lung function, namely spirometers for medical use and structural parts therefor in the nature of mouthpieces, electronic meters for medical use in the nature of peak flow meters for use in measuring lung airflow and forced expiratory volume for use in assessing lung health, spirometers for medical use featuring integrated electronic diaries, medical apparatuses for diagnosing respiratory conditions in the nature of respirometers, lung airflow and gas analyzers for medical diagnostics, and medical apparatuses in the nature of plethysmographs for measuring respiratory function; medical devices to aid in delivery of aerosol to the lungs, namely aerosol holding chambers and dispensers for medical use; medical dosimeters for use in diagnostic airway challenge spirometry protocols; medical equipment accessories, namely air volume syringes for use in calibrating and validating spirometry equipment, and biologic filters for use in isolation of patients from cross-contamination during spirometry testing, and nose clips for focusing airways during pulmonary function tests