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- BIPM: The FB2 flexure-strip balance, the BIPM's modern precision balance featuring a standard deviation of one ten-billionth of a kilogram (en)
- Micro-g LaCoste: FG5 absolute gravimeter, , used in national laboratories to measure gravity to 2μGal accuracy (en)
- NPL: The NPL's Watt Balance project (en)
- The Age: Silicon sphere for the Avogadro Project (en)
- BIPM: Steam cleaning a 1 kg prototype before a mass comparison (en)
- BIPM: Mettler HK1000 balance, featuring 1μg resolution and a 4kg maximum mass. Also used by NIST and Sandia National Laboratories' Primary Standards Laboratory (en)
- NIST: K20, the US National Prototype Kilogram resting on an egg crate fluorescent light panel (en)
- NIST: This particular Rueprecht Balance, an Austrian-made precision balance, was used by the NIST from 1945 until 1960 (en)
- BIPM: The IPK and its six sister copies in their vault (en)
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