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Listen to native speakers pronounce “photometer” in real conversational contexts with synchronized timestamps and subtitles.
I mean, I don't know if it's really him, but somebody is sitting there.So to do this work, the brightness work, he had to build his own photometers.And at first, he attached them to this instrument.
An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.
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