"LRTK" is an innovative Japanese device that, by attaching to a smartphone or tablet, achieves centimeter-level precision positioning, revolutionizing traditional field surveying. Despite its lightweight, compact design, it integrates a battery and high-performance antenna, enabling diverse tasks like single-point and continuous positioning, 3D point cloud scanning, volume calculations, and coordinate guidance. Accurately recording positional and directional data with photos, it supports real-time data sharing and centralized management through cloud integration. Incorporating augmented reality (AR), "LRTK" swiftly projects precise construction plans onto worksites, significantly reducing workload and construction duration in civil engineering, surveying, infrastructure maintenance, and disaster response.