Designed for professionals in utility work, geology, and treasure hunting, the Fisher Gemini-3 is a two-box metal detector built for locating large, deeply buried targets. Unlike conventional detectors, the Gemini-3 excels at tracing ore veins, detecting underground tanks, or locating long-buried cache sites with unmatched depth and reliability. Its standout feature is its Voltage Controlled Oscillator (V.C.O.) audio target response, which allows for precise pinpointing even in challenging environments.

With the ability to detect large targets like 55-gallon drums at depths up to 10 feet—and even deeper for larger objects—the Gemini-3 delivers serious performance. It uses a crystal-controlled 81.92 kHz frequency and operates in both inductive and conductive modes, making it suitable for tracing pipes, cables, and mineral deposits. Dual search modes (narrow and wide scan) allow for flexible operation across varying terrains, while the analog meter and audio signals give clear feedback. Operators can fine-tune sensitivity for different conditions, and optional ground rod assemblies enable conductive tracing for buried lines with exposed access.

The Gemini-3 features a rugged yet lightweight frame with an ergonomic handle and padded grip for all-day comfort. Powered by standard AA batteries, it offers up to 30 hours of use on the receiver and 25 hours on the transmitter. The moisture-resistant speaker cone, weather-ready design, and durable construction ensure dependable operation in the field. Whether mapping ore zones or locating utility lines, the Gemini-3 offers reliable, high-performance detection in a professional-grade package.