ratiometer

[ rey-shee-om-i-ter ]
/ ˌreɪ ʃiˈɒm ɪ tər /

noun

(in three-color photography) a device for determining the exposure factors of the filters to be used.

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Origin of ratiometer

1920–25, for an earlier sense; ratio + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020