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特許 係属中 A tiltmeter is an instrument designed to measure very small changes from the vertical level, either on the ground or in structures.[1] A similar term, in less common usage, is the inclinometer. Tiltmeters are used extensively for monitoring volcanoes, the response of dams to filling, the small movements of potential landslides, the orientation and volume of hydraulic fractures, and the response of structures to various influences such as loading and foundation settlement.