inclinometer

An instrument that displays the angle of an aircraft relative to the horizon.

An instrument that measures magnetic dip; a dip circle.

A surveying instrument that measures angles of inclination or elevation; a clinometer.

For the ground, that means using three primary types of equipment: ■ Extensometers to look for ground heave - the upwards movement of soil, which can occur at any stage. It is essentially the opposite of erosion and is often associated with clay-type soils which swell when wet. ■ Inclinometers, which measure slope movements. ■ Piezometers to measure water levels.