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tyndallometer

noun
tyn·​dall·​om·​e·​ter | \ˌtindᵊlˈämətə(r)\

Definition of tyndallometer 

: an apparatus for measuring the brightness of the Tyndall beam

— called also Tyndall meter

— compare nephelometer

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History and Etymology for tyndallometer

tyndall (beam) + -o- + -meter

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