All engineering phenomena deal with definite and measured quantities and so depend on the making of the measurement. We must be clear and precise in making these measurements. To make a measurement, magnitude of the physical quantity (unknown) is compared.
The record of a measurement consists of three parts, i.e. the dimension of the quantity, the unit which represents a standard quantity and a number which is the ratio of the measured quantity to the standard quantity.
A device which is used for measurement of length to an accuracy of about `10^(-3)m`, is
Options:
(a) screw gauge
(b) spherometer
(c) vernier callipers
(d) Either ( a) or ( b)