Why is calibration of sampling equipment and monitors an important step in the sampling process?

Calibration is the process in the which equipment is adjusted to maintains its accuracy while it is used for the evaluation and measurement. The precision while taking the readings is gained from this step which produces the exact reading.

It monitors that there is no occurrence of any king of uncertainty which may lead to the incorrect calculation consisting these recorded values. It is considered as error avoidance parameter in the sampling method.