Editing Spirometer (section)

==Types of spirometer==

===Whole body plethysmograph===
{{Main|Body plethysmography}}
This type of spirometer gives a more accurate measurement for the components of lung volumes as compared to other conventional spirometers. A person is enclosed in a small space when the measurement is taken.

===Pneumotachometer===
This spirometer measures the flow rate of gases by detecting pressure differences across fine mesh. One advantage of this spirometer is that the subject can breathe fresh air during the experiment.<ref>{{cite web |url=http://home.btconnect.com/MalcolmBrown/entries/PNEUMOTACHOMETER_GRAPH.html |title=Pneumotachometer/Graph |access-date=26 December 2009}}</ref>

===Fully electronic spirometer===
Electronic spirometers have been developed that compute airflow rates in a channel without the need for fine meshes or moving parts. They operate by measuring the speed of the airflow with techniques such as ultrasonic transducers, or by measuring pressure difference in the channel. These spirometers have greater accuracy by eliminating the momentum and resistance errors associated with moving parts such as windmills or flow valves for flow measurement. They also allow improved hygiene by allowing fully disposable air flow channels.

===Incentive spirometer===
{{Main|Incentive spirometer}}
This spirometer is specially designed to encourage improvement of one's lung function.

===Peak flow meter===
{{Main|Peak expiratory flow}}
This device is useful for measuring how well a person's lungs expel air.

===Windmill-type spirometer===
This type of spirometer is used especially for measuring [[forced vital capacity]] without using water; it has broad measurements ranging from 1000 ml to 7000 ml. It is more portable and lighter than traditional water-tank type spirometers. This spirometer should be held horizontally while taking measurements because of the presence of a rotating disc.

===Vitalograph ===
This instrument is used to measure vital capacity. It has a double walled metallic cylindrical chamber filled with water between two cylinders.<ref>{{Cite journal |last=Perks |first=W. H. |last2=Sopwith |first2=T. |last3=Brown |first3=D. |last4=Jones |first4=C. H. |last5=Green |first5=M. |date=August 1983 |title=Effects of temperature on Vitalograph spirometer readings |url=https://pubmed.ncbi.nlm.nih.gov/6612650/ |journal=Thorax |volume=38 |issue=8 |pages=592–594 |doi=10.1136/thx.38.8.592 |issn=0040-6376 |pmid=6612650|pmc=459617 }}</ref>