Tiltmeters for monitoring applications provide measurements of changes from the vertical level, either on the ground or in structures. This makes them key sensors to monitor inclinations, movements and differential settlements of slopes or infrastructures. For example they can be applied to vertical structures as columns, piers, pylons, facades or retaining walls to track the changes in inclinations and detect differential settlement; or they can be installed to verify over time the geometry and stability of tunnels, railway tracks (cant, twist and vertical alignment) or bridges decks. Tiltmeters have been as well extensively used in landslides, embankments and mines monitoring to control the stability of the slopes.