The manual inclinometer monitoring set is an advanced instrument for measuring subsurface horizontal displacements, designed for high-criticality geotechnical and structural applications. The instrument consists of a removable inclinometer probe equipped with high-precision biaxial MEMS sensors, a metered cable with a cable reel, and a digital acquisition setup based on wireless communication and mobile devices. Inserted inside inclinometer casing, the probe measures inclination variations along the vertical axis, enabling reconstruction of deformation profiles and analysis of displacement over time. Integration with dedicated smartphone applications and data management tools allows rapid field acquisition, immediate visualization of results, and direct transmission of data from site to remote platforms or cloud-based environments. Thanks to its modular architecture and the possibility of using the same probe across multiple installations, the instrument represents a flexible, cost-effective, and highly efficient solution for periodic monitoring campaigns.