La Metrología se considerar habitualmente dividida en tres categorías, cada una de ellas con diferentes niveles de complejidad y exactitud:
1-La Metrología Científica, que se ocupa de la organización y el desarrollo de los patrones de medida y de su mantenimiento (el nivel más alto).
2-La Metrología Industrial, que asegura el adecuado funcionamiento de los instrumentos de medida empleados en la industria y en los procesos de producción y verificación.
3-La Metrología Legal, que se ocupa de aquellas mediciones que influyen sobre la transparencia de las transacciones comerciales, la salud y la seguridad de los ciudadanos.
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