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Answer for the clue "Volcanologist's instrument ", 9 letters:
tiltmeter

Word definitions for tiltmeter in dictionaries

Wiktionary Word definitions in Wiktionary
n. An instrument designed to measure very small changes from the horizontal level

Wikipedia Word definitions in Wikipedia
A tiltmeter is a sensitive inclinometer designed to measure very small changes from the vertical level, either on the ground or in structures. Tiltmeters are used extensively for monitoring volcanoes , the response of dams to filling, the small movements ...

Usage examples of tiltmeter.

With relief, he set down his seismometers and miniaturized cospec and pyrometers, tiltmeters and cameras, and connected them up via a laptop pc to a satellite transponder.