radio-micrometer

radiomicrometer

[rey-dee-oh-mahy-krom-i-ter]
noun
an instrument for measuring small amounts of radiant energy, consisting of a sensitive thermocouple connected to a galvanometer.

Origin:
1885–90; radio- + micrometer

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World English Dictionary
radiomicrometer (ˌreɪdɪəʊmaɪˈkrɒmɪtə)
 
n
an instrument for detecting and measuring small amounts of radiation, usually by a sensitive thermocouple

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