You may be thinking that why to spend money over calibration? Actually, the fact is that the accuracy of all measuring devices degrades over time. This is typically caused by normal wear and tear. However, changes in accuracy can also be caused by electrical or mechanical shocks or a hazardous manufacturing environment (e.g., oils, metal chips etc.). Depending on the type of instrument and the environment in which it is being used, it may degrade very quickly or by a long period of time. So, the bottom line is that calibration maintain the accuracy of the measuring device and consequently accurate measuring devices improves product quality.

So, the goal of calibration is to minimise any measurement uncertainty by ensuring the accuracy of test equipment. Calibration quantifies and controls errors or uncertainties within measurement processes to an acceptable limit.