transmissometer

noun
trans·​mis·​som·​e·​ter | \ˌtran(t)s-(ˌ)mi-ˈsä-mə-tər, ˌtranz-\

Definition of transmissometer 

: an instrument for measuring the transmission of light through a fluid (such as the atmosphere)

First Known Use of transmissometer

circa 1931, in the meaning defined above

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The first known use of transmissometer was circa 1931

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