The portable tiltmeter is used to monitor changes in the inclination of a structure. Tiltmeter data can provide an accurate history of movement of a structure and early warning of potential structural damage. Typical applications include:

-Monitoring rotation caused by mining, tunneling, soil compaction, or excavation.

-Monitoring rotation of concrete dams and retaining walls.

Source:http://www.slopeindicator.com/instruments/tilt-portable.php

Link to report of this instrument: TMU