Most accurate kilogram

According to Official Guinness Records,

The kilogram is the only base SI unit of measurement whose definition is still based on a physical prototype. The world's most accurate kilogram is a cylinder made of platinum and iridium, made in 1889, and maintained at the Bureau International des Poids et Mesures (BIPM) at Sèvres near Paris, France. Scientists are currently attempting to change the definition of the kilogram by linking it to more and more precise measurements of Planck's constant.

For a complete list of 2013 records, please visit 2013 Guinness Records in France.

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