Chemistry, Spectroscopy. a device used to excite radiation by a material in order to determine chemical or elemental composition from the emission spectrum produced.
Surgery. a miniature probe for use in microsurgery.

1955–60; micro- + probe

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Here, a montage of meteorite samples are subjected to an electron microprobe to reveal their mineral composition.
The sample was later imaged with the x-ray fluorescence microprobe to monitor selenium redistribution.
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