The measurements made can be categorized as 1.Direct measurement 2.Differential measurement 3.Transfer measurement 4.Ratio measurement 5.Indirect measurement
Direct measurement Direct measurement are made by placing an instrument directly into contact with the phenomenon that is to be measured
Differential measurement Differential measurement are made by using an instrument to measure the difference between known and unknown quantities of the same value
Indirect measurement Indirect measurement find the value of interest from other values.