A scientific instrument that measures the intensity and wavelength of fluorescence emitted by a sample, used in research and medical diagnostics.
From fluoro- + Greek metron, 'measure'. This instrument term emerged in the mid-20th century as fluorescence spectroscopy became a key analytical tool.
A fluorometer can measure the exact brightness of a glowing molecule—so sensitive it can detect a single virus or trace a drug through your bloodstream by watching it glow.
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