For success, all depend upon proper calibration and traceability to national standards. As components age and equipment undergoes changes in temperature or sustains mechanical stress, critical performance gradually degrades. This is called drift . When this happens your test results become unreliable and both design and production quality suffer. Whilst drift cannot be eliminated, it can be detected and contained through the process of calibration.
Calibration is simply the comparison of instrument performance to a standard of known accuracy.
By making sure that your measurements are based on international standards, you promote customer acceptance of your products around the world. But if you're still looking to justify that the cost of calibration does add value, check-out some of the calibration horror stories that have been reported. Of course, even with proper calibration it's still possible to make bad measurements if the equipment isn't correctly used.