Calibrating involves comparing measurements of any two instruments. One standard device with a known correctness, and two, the unit that needs to be measured. Calibration has been defined by the International Bureau of Weights and Measures as an “Operation that, under specified conditions, in the first step, establishes a relation between the quantity values with measurement uncertainties provided by the measurement standards and corresponding indications with associated measurement uncertainties (of the calibrated instrument or secondary standard) and, in the second step, uses this information to establish a relation for obtaining a measurement result from an indication”.

The following are the reasons why we need to be calibrate our instruments regularly:

1.  Often we don’t have the right equipment or expertise to check if any instrument supplied by a manufacturer is correct as per the specifications  agreed during purchase. So calibration is necessary to check its accuracy.
2. As you use instruments, they cause wear and tear as we keep using them daily. Some instruments need to be checked if they are being used in factories etc. to produce bulk products. Also the products need to be checked for quality assessment, because the products manufactured from the instrument manufactured undergoes changes due to wear and tear. This indicates that the  accuracy of an instrument has been deviated.
3. We need to calibrate the instruments to know the exact deviation

• The inspection activity needs to be precise, because there is always some difference in reading displayed by the instrument compared to the actual value. Calibration actually checks  which readings are deviating from actual values so that we can add or subtract to get the final precise reading.

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