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✅ SINCE 1931 – THE PIONEER IN METAL DETECTING

Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.
Gemini 3
Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.
Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.
Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.
Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.
Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.
Gemini 3
Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.
Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.
Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.
Fisher GEMINI-III Two-Box Metal Detector with deep-seeking technology, dual antenna system, and adjustable ground balance, designed for locating large, buried objects and caches at extreme depths.

Gemini 3

Fisher: Since 1931
$959.00 USD
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Product Description

The Fisher Gemini-3 is an advanced two-box metal detector designed for detecting large, deep objects such as ore veins, pipes, and cables, making it ideal for prospectors, geologists, treasure hunters, and public utility companies. Operating at an 82 kHz frequency, the Gemini-3 excels in identifying deep, buried targets. Its Voltage Controlled Oscillator (VCO) provides variable audio pitch, allowing for precise pinpointing of objects. Equipped with both inductive and conductive trace modes, it offers flexibility in different search conditions, ensuring reliable performance across various terrains. The Gemini-3’s 60-cycle noise reduction circuitry minimizes interference from electrical sources, making it a dependable tool even in challenging environments.


Crafted with durability and ease of use in mind, the Gemini-3 boasts a lightweight design, weighing only 7.5 lbs, and features user-friendly controls, including a battery test meter and power on/off push-pull switches for straightforward operation. This detector is powered by 16 AA batteries, offering up to 30 hours of use on alkaline cells. Proudly made in the USA and backed by a 5-year warranty, the Fisher Gemini-3 provides professionals and hobbyists alike with a high-quality, dependable solution for deep-seeking detection tasks.


Purpose: Deep-seeking and cache locating for large buried objects, ore veins, pipes, and utilities. Ideal for prospectors, geologists, treasure hunters, and utility companies.

Specifications

  • Operating Frequency: 81.92 kHz
  • Detection Capability: Sensitive to large, deep objects and ore veins
  • Operating Modes:
    • Inductive Trace
    • Conductive Trace
    • Wide Scan Inductive Trace
  • V.C.O. Audio Response: Precision pinpointing with variable volume and pitch
  • Target Depth: Detects objects up to 10-15 feet deep (depending on ground conditions)
  • Noise Reduction: 60-cycle noise reduction circuitry minimizes electrical interference
  • Battery Life:
    • 25 hours for the transmitter
    • 30 hours for the receiver (using alkaline batteries)
  • Battery Type: Requires 16 AA batteries (8 for the transmitter, 8 for the receiver)
  • Signal Strength Indicator: Numerical and bar-graph display for clear signal reading
  • Battery Status Indicator: 3-color indicator (green, red, amber) on the transmitter
  • Dimensions: Transmitter-Receiver Box Assembly: 9-¼" x 12" x 6"
  • Weight:
    • Complete system: 7.5 lbs
    • Transmitter: 2.5 lbs
    • Receiver: 3.0 lbs
    • Handle: 2.0 lbs
  • Audio Output: 2-¼" speaker with 100-ohm moisture-proof cone
  • Headphone Compatibility: ¼" jack for 8-16 ohms stereo or mono headphones
  • Manufacturer: Fisher Research Labs (a Subsidiary of First Texas Products)
  • Brand Name: Fisher Research Labs (a Subsidiary of First Texas Products)
  • Country of Origin: USA

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    Gemini 3

    Support

    For more information and to purchase, visit where to buy , email us , chat with us, or call us at 1-800-685-5050   for any questions.
    For repair service in warranty or out of warranty please fill out the RMA form.

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    Frequently Asked Questions

    What is the maximum effective depth of the Gemini-3 in highly mineralized soil?

    In neutral soil, the Gemini-3 can detect a large object, such as a 55-gallon drum, at depths of up to 10 feet. However, in highly mineralized soil, detection depth may be reduced by up to 60%, meaning the same object may only be detectable at around 4–5 feet.

    Can the Gemini-3 detect non-metallic objects?

    No, the Gemini-3 is specifically designed to detect conductive materials, such as metals and mineralized ores. It does not detect plastics, ceramics, or other non-conductive materials.

    Why does the Gemini-3 sometimes give false signals over wet ground?

    Wet ground can contain dissolved mineral salts, which can conduct electricity and produce false signals. If the ground is highly conductive, signals from deep metal objects may become distorted or masked.

    How does the shape of a buried object affect its detectability?

    Objects with a looped or ring shape lying flat tend to generate stronger signals than rod-shaped objects positioned vertically. Flat and dish-shaped objects also provide good detection results, whereas long, thin objects oriented perpendicular to the search direction can be more challenging to locate.

    Can the Gemini-3 detect underground pipes even if they are non-metallic?

    No, the Gemini-3 requires a conductive target. However, some non-metallic pipes with metallic fittings or traces of conductive materials may be detectable.

    How does battery voltage affect the performance of the Gemini-3?

    The transmitter and receiver operate best with 8 fresh AA batteries each. As battery voltage drops below 7V, the transmitter power weakens, reducing detection depth and accuracy.

    Can the Gemini-3 differentiate between different types of metals?

    No, the Gemini-3 does not have discrimination features. It detects all conductive metals, including ferrous and non-ferrous materials, but cannot distinguish between them.

    What is the best method for pinpointing the exact location of a buried object?

    The Narrow Scan Inductive Search method is best for pinpointing small or short objects like a buried chest or a cache. By marking the strongest signal points from multiple angles, you can triangulate the object's precise location.

    Why does the Gemini-3 lose signal over long distances when tracing a pipe or cable?

    The signal weakens due to distance from the transmitter, soil mineralization, and potential junctions in the pipe or cable that cause the signal to disperse. If tracing a pipe, a non-conductive gasket or a break in the metal can also interrupt the signal.

    Can the Gemini-3 detect black sand deposits associated with gold placer deposits?

    Yes, the Gemini-3 can detect black sand and iron sulfides, which are often associated with placer gold. While it cannot detect individual gold flakes, it can help locate areas where gold deposits are likely to be found.

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    Landon Howlett
    "...he found his first coin. A 1946 wheat. I'm glad to say we have a new Digger in the family."
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    JimDoan
    Jim Doan
    This is a Union Officers belt plate from the Civil War, it was found at a G.A.R. 1895 Civil War reunion encampment...
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    Ryan Vecchio
    "...great detector please keep me informed on the new machines coming out I got pictures of your detectors for years finding things in fields that have been hunted by everything till the first Texas hit the ground." 
    - Bounty Hunter Platinum
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    James K.
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