Metrology: Measuring Instruments and Gauges

Knowledge about any thing is complete only when it can be expressed in numbers and something is known about it. Thus for every kind of quantity measured,there must be a unit to measure it and express it in numbers of that unit. The unit has to be followed by all and hence there must a universal standard. Most important parameter in Metrology is the length which can be measured in several forms and in several ways. A measurement plays a vital role in every field of investigation and present days Scientific and Technological progress has resulted from progress in the field of measurements.