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karui

In Agades, a city in present-day Niger, mid-19ᵗʰ century, a unit of mass = 33¹⁄₃ mitkals, about 150 grams. There was also a large karui = 100 mitkals = 1 ratl, about 450 grams.

Henry [Heinrich] Barth.
Travels and Discoveries in North and Central Africa: being a journal of an expedition undertaken under the auspices of H. B. M.'s government, in the years 1849-1855.
London: Longman, Brown, Green, Longmans & Roberts, 1857-1858.

Volume 1, page 467.