
1) Measuring device 2) Measuring instrument 3) Measuring system
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https://www.crosswordclues.com/clue/spirometer

A spirometer is an apparatus for measuring the volume of air inspired and expired by the lungs. A spirometer measures ventilation, the movement of air into and out of the lungs. The spirogram will identify two different types of abnormal ventilation patterns, obstructive and restrictive. There are various types of spirometers which use a number of...
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http://en.wikipedia.org/wiki/Spirometer

instrument measuring lung capacity
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http://phrontistery.info/s.html

• (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.
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http://thinkexist.com/dictionary/meaning/spirometer/

An instrument that is used to measure the volume of air that is breathed in or out. It can be used to assess how well the lung is working, for example by measuring the maximum volume of air that can be breathed out (vital capacity).
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http://www.encyclo.co.uk/local/20560

(spi-rom´ә-tәr) an instrument for measuring air inhaled into and exhaled out of the lungs; it provides a simple way of determining most of the lung volumes and capacities that are measured in pulmonary function tests.
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http://www.encyclo.co.uk/local/21001
Spi·rom'e·ter noun [ Latin
spirare to breathe +
-meter .] 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. Confer
Pneumatometer .
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http://www.encyclo.co.uk/webster/S/166

Apparatus used to determine the capacity of the lungs.
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http://www.gadsbywicks.co.uk/uploaded/3822.pdf

Type: Term Pronunciation: spī-rom′ĕ-tĕr Definitions: 1. In clinical practice and research, any device used for measuring flows and volumes, inspired and expired by the lungs, thus assessing pulmonary function. Considered the most basic measurement device of pulmonary function.
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http://www.medilexicon.com/medicaldictionary.php?t=83856

[
n] - a measuring instrument for measuring the vital capacity of the lungs
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http://www.webdictionary.co.uk/definition.php?query=spirometer
noun a measuring instrument for measuring the vital capacity of the lungs
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https://www.encyclo.co.uk/local/20974
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