Daniell Hygrometer is an instrument for measuring the comparative moisture of the air.
This hygrometer was first described in an article entitled, "On the new hygrometer, by J.F. Daniell, Esq., FRS and MRI. (Art XI in the Quart. Jour. Of Sciences, Literature, and the Arts. Vol IX, pp. 128-137. London, 1820.) In 1827 he published again a description of the hygrometer which bears his name
The directions for the use of this instrument are also given by Negretti and Zambra (A Treatise on Meteorological Instruments, London, 1864).

John Frederic Daniell (1790-1845) was the Professor of Chemistry at King's College, London and is best known for his Electro-Chemical Cell that he devised in 1836.

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