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trans·mis·som·e·ter | \ ˌtran(t)s-(ˌ)mi-ˈsä-mə-tər 
, ˌtranz- \
, ˌtranz- \Definition of transmissometer
: an instrument for measuring the transmission of light through a fluid (such as the atmosphere)
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Time Traveler for transmissometer
The first known use of transmissometer was circa 1931
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