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Vertical inclinometer is the primary monitoring instrument used to measure the horizontal subsurface deformation in a borehole. It can be used to monitor the lateral deformation of soil and rock in the different geotechnical applications such as deep excavations, diaphragm wall and retaining walls, high open excavation and stability of embankments. In general, there are two types of inclinometers: portable inclinometers and in-place sensor systems. However, the first type is more commonly used in geotechnical projects. The portable vertical inclinometer consists of a guide casing embedded in the ground, a portable bi-axial wheeled probe, a graduated control cable, and the readout data acquisition system. The probe travels along the casing using the cable, measures the deflection of the casing and transfers the data to the readout unit.