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ratiometer

[rey-shee-om-i-ter] /ˌreɪ ʃiˈɒm ɪ tər/
noun
1.
(in three-color photography) a device for determining the exposure factors of the filters to be used.
Origin
1920-1925
1920-25, for an earlier sense; ratio + -meter
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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