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Kenneth G. Wilson (1923–).  The Columbia Guide to Standard American English.  1993.
 
hydrometer, hygrometer (nn.)
 
 
A hydrometer is an instrument for measuring the specific gravity of liquids. A hygrometer is an instrument for measuring the amount of moisture in the air.  1
 
 
The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press.

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