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Today digital meters are replacing analog meters in every sector whether its electricity meter or taxi fare meter. The main reason for that is analog meters have mechanical parts that tend to wear when used for long time and they are not as accurate as digital Meters.
A good example for this is analog speedometer and odometer that is used in old motor bikes for measuring speed and distance travelled. They have a special parts called pinion and rack arrangement in which a cable is used to rotate speedometer’s pin when wheel is rotated. This will wear out when using for long period and also needs replacement and maintenance.
In digital meter, instead of using mechanical parts, some sensors like optical interrupter or hall sensor is used to calculate the speed and distance. This is more accurate than the analog meters and doesn’t require any maintenance for long period of time.
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