tachometer

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ta·chom·e·ter

(tă-kom'ĕ-tĕr),
An instrument for measuring speed or rate; for example, revolutions of a shaft, heart rate (cardiotachometer), arterial blood flow (hemotachometer), respiratory gas flow (pneumotachometer).
[G. tachos, speed, + metron, measure]

tachometer

[təkom′ətər]
a device for measuring speed, such as the rate of blood flow in a vessel.

ta·chom·e·ter

(tak-om'ĕ-tĕr)
An instrument for measuring speed or rate, e.g., revolutions of a shaft, heart rate (cardiotachometer), arterial blood flow (hemotachometer), respiratory gas flow (pneumotachometer).
[G. tachos, speed, + metron, measure]