How Metal Detectors Work - Photographs and animations show function and anatomy of VLF, PI and BFO metal detectors. Metal Detector Reviews - User contributed product evaluations and discussion forums. Metal Detectors - Has schematic diagram for a one-coil induction metal detector. Excerpt from Metal Detectors for Treasures and Relic Hunting by Andrei Chtchedrine. Bilingual English/Russian site. This and That - Offers advice on air testing metal detectors, pinpointing probes, tips, and stories about Melvin Cogsworth, a private detectorist. Metal Detector Manuals - Find all brands of metal detector manuals in one location. Includes directory and downloads. Ohio Metal Detecting - Provides information and guidelines for metal detecting in Ohio. Geotech - Features magazine articles with projects and schematics to build frequency-shift, induction balance and pulse induction metal detectors, coils and probes. Includes articles about the history of detectors, links to manufacturers, and reference sources.