The correct option is C Vernier Caliper
A calliper is a device used to measure the distance between two opposing sides of an object.
The Vernier Calliper consists of a main scale fitted with a jaw at one end. Another jaw, containing the vernier scale, that moves over the main scale. When the two jaws are in contact, the zero of the main scale and the zero of the Vernier scale should coincide. In case they do not coincide, then it is said to have a positive or negative zero error.