Metrology comes from the Greek word metro,meaning “to measure something.” Therefore metrology is the science and practice of measurement. The measurement is conducted using quantitative equipment which requires calibration on a regular basis.
Calibration is a comparison of two measurement devices or systems, one from a known uncertainty (the standard) and one of unknown uncertainties (the test equipment or instruments being used). Every day there are numerous applications proving how useful calibration is. Without calibration, or with incorrect calibration procedures, we may pay more at the gas pump or for food incorrectly weighed at the checkout counter or even encounter problems as simple as our car door not shutting properly.