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Bathometer and Spirometer

noun

  • An instrument that measures the depth of water.
(n.) An instrument for measuring depths, especially one for taking soundings without a sounding line.

noun

  • A measuring instrument for measuring the vital capacity of the lungs. .
(n.) An instrument for measuring the vital capacity of the lungs or the volume of air which can be expelled from the chest after the deepest possible inspiration. Cf. Pneumatometer.