Calibration: Ensuring Accuracy with Certified Standards

• Calibration - marking or adjusting a scale so that readings on an instrument conform to accepted and certified standards. • Standard is usually defined by a legal or recognised agency, e.g. the International Organisation for Standardisation (ISO). • So… the comparison of an instrument or measuring device with a known standard • May be a primary, secondary or tertiary standard • Or… absolute, intermediate (or transfer) and laboratory standards respectively