hair hygrometer

American  

noun

1. a hygrometer actuated by the changes in length of a strand of human hair brought about by changes in the relative humidity.

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Etymology

Origin of hair hygrometer

First recorded in 1875–80

Example Sentences

Your hair hygrometer may not actually be this accurate, but it can give you a rough approximation of changes in humidity.

From Scientific American

How similar are the readings between your hair hygrometer and these precise instruments?

From Scientific American

It is of interest here to record that at the moment of writing a series of experiments are in progress in which an attempt is being made to use a hair hygrometer for this purpose.

From Project Gutenberg

The mean annual temperature of the valleys of Aragua is nearly 25.5 degrees; my hygrometrical observations of the month of February, taking the mean of day and night, gave 71.4 degrees of the hair hygrometer.

From Project Gutenberg

"A hair hygrometer," he said to me, waving his wax-like hand over it.

From Project Gutenberg