1. Direct method of measurement:
This is a simple method of measurement, in which the value of the quantity to be measured is obtained directly without any calculations. For example, measurements by using scales, vernier callipers, micrometers, bevel protector etc. This method is most widely used in production. This method is not very accurate because it depends on human insensitiveness in making judgment.
2. Indirect method of measurement:
In indirect method the value of quantity to be measured is obtained by measuring other quantities which are functionally related to the required value. e.g. angle measurement by sine bar, measurement of screw pitch diameter by three wire method etc.