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OIML Calibration Weights

The International Organization of Legal Metrology (OIML) is an intergovernmental organization founded in 1955 that develops and promotes international standards for legal metrology, which is the science of measurement applied to law and regulations. OIML's mission is to harmonize and standardize metrology practices worldwide to facilitate fair trade, protect consumers, and ensure the uniformity and accuracy of measurements.


OIML plays a crucial role in establishing standards for various aspects of metrology, including mass standards, or calibration weights. The OIML standard for mass standards provides guidelines and specifications for the design, manufacture, calibration, and use of calibration weights and other mass standards used in trade, industry, and scientific applications. The OIML standard for calibration weights covers a wide range of requirements, including material composition, shape, dimensions, surface finish, tolerance limits, marking, and verification procedures. These standards aim to ensure the accuracy, reliability, and traceability of mass measurements across different sectors and regions.


By adhering to OIML standards for calibration weights, manufacturers, calibration laboratories, and regulatory bodies can establish a common framework for the calibration and certification of weights, ensuring consistency and comparability of measurements. This promotes confidence in the accuracy and fairness of transactions involving mass measurements, facilitating trade and supporting economic growth.

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