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Answer for the clue "Radiometer that is extremely sensitive ", 15 letters:
radiomicrometer

Word definitions for radiomicrometer in dictionaries

WordNet Word definitions in WordNet
n. radiometer that is extremely sensitive

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Radiomicrometer \Ra`di*o*mi*crom"e*ter\ (r[=a]`d[i^]*[-o]*m[-i]*kr[o^]m"[-e]*t[~e]r), n. [Radio- + micrometer.] (Physics) A very sensitive modification or application of the thermopile, used for indicating minute changes of radiant heat, or temperature.

Wiktionary Word definitions in Wiktionary
n. a device used to measure small changes in radiant heat, or in temperature