A #tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.
An #odometer or odograph is an instrument used for measuring the distance traveled by a vehicle, such as a bicycle or car. The device may be electronic, mechanical, or a combination of the two.
A #speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle.
Негізгі бет Ғылым және технология Speedometer, Tachometer And Odometer(हिन्दी )
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