The device which attached with the wheel of any vehicle and records the number of revolutions of the wheel is known as odometer.
The number of revolutions multiplied by the circumference of the wheel and records the distance.
The instrument provided with single wheel with forks and handle to measure the distance between
two points is known as perambulator.
The instrument is wheeled along the line the length of which is desired.The distance traverse
is automatically registered on the dials.