Ground search metal detectors are devices used to locate metal objects buried underground. They work by emitting electromagnetic fields and detecting changes in these fields caused by metal objects. These detectors are commonly used in various applications, including treasure hunting, archaeological digs, and security screenings. These devices come in different types, such as VLF (Very Low Frequency) and PI (Pulse Induction), each suited for specific environments and metal types. Users can adjust settings to improve detection depth and sensitivity, making them versatile tools for both hobbyists and professionals in fields like law enforcement and construction.