spirometer

noun

1. An instrument for measuring the air capacity of the lungs.

   “In humans, a spirometer can be used to record and measure lung volumes and oxygen consumption (illustration 1).”

   “2002, H. Nancy Holmes (editorial director), Illustrated Manual of Nursing Practice, Wolters Kluwer Health (Lippincott Williams & Wilkins), 3rd Edition, page 154, While all spirometers encourage slow, sustained maximal inspiration, they can be divided into two types: flow incentive and volume incentive.”

   “Wet-type spirometers (such as the classical bell spirometer with a water seal) are simple and accurate but are no longer in use as they have a hygiene problem; they are distinguished from dry-type spirometers (e.g., bellows or piston spirometer).”