Drager respirometer

Drä·ger res·pi·rom·e·ter

(drā'gĕr),

an inferential meter to measure tidal and minute volume from the number of revolutions of a vane rotated by the gas stream as the latter passes through two lightweight lozenge-shaped meshing rotors.

Dräger,

Heinrich, German manufacturer of industrial and diving respiratory apparatus, 1898–.

Dräger respirometer - an inferential meter to measure tidal and minute volume.