dust counter

noun

1. any instrument used to measure the size and number of dust particles per unit volume in the atmosphere.

Word History and Origins

Origin of dust counter¹

First recorded in 1890–95

Example Sentences

It is not nearly so accurate as the dust-counter; but it is cheaper, more easily wrought, and more handy for quick work.

From Project Gutenberg

To show the hazing effects of dust it is not, however, necessary to use a dust counter.

From Project Gutenberg