Accurate measurements play a essential role at every stage in development and production of best product. The effectiveness of nice control steps relies upon directly at the accuracy and self assurance with which the take a look at & measuring units (tmi) can yield check outcomes. Therefore systematic and periodic checking of take a look at & measuring devices is very vital for reliable measurements. The process of periodic checking of tmi by using comparison with some other tool of better accuracy is called as calibration.
Similarly for international exchange of goods, merchandise & era and interchangeability of additives & components, it's miles essential that size represents the equal amount anywhere. This is feasible only while the measurements have a common place reference base, that's across the world ordinary. This common reference base is the si unit of dimension. The same old is the physical recognition of the unit of size. The method of ensuring that our dimension system from a not unusual reference base is termed as traceability.
