Automobiles are fitted with a device that shows the distance travelled. Such a device is known as
A speedometer or a speed meter measures and displays the instantaneous speed of a vehicle.
A cathetometer is an instrument for measuring vertical distances where a scale cannot be placed very close to the points.
An odometer is an instrument for measuring the distance travelled by a vehicle.
A lactometer is used to check purity of cow's milk.
The correct option is C.