The necessity of metrology is driven by three commercial and technical factors:
| Pillar | Purpose | Real-World Example | | :--- | :--- | :--- | | | Establishing fundamental measurement standards (e.g., the definition of a kilogram or a meter). | NIST (USA) or NPL (UK) maintaining atomic clocks and length standards. | | 2. Industrial Metrology | Applying measurements on the factory floor to ensure parts meet specifications. | A CMM (Coordinate Measuring Machine) checking an engine block. | | 3. Legal Metrology | Regulating measurements for fairness, safety, and trade (e.g., gas pumps, food labels). | Weights and measures inspections at a grocery store scale. | what is metrology in manufacturing