The MDIP-3 Multi-functional Digital DC Induction Magnetometer is a self-developed instrument by our company, utilizing the latest electronic technology such as 24-bit A/D conversion and ARM chip. It is widely applicable in karst regions, ore bodies, archaeological sites, and civil engineering surveys; as well as in the investigation of embankment hazards, landslides, and other geological disasters; and for the evaluation of site conditions for highways, railways, bridges, and structures.