Fisher Labs Gemini-3 - User Manual

Gemini-3
Operating Manual
Deep Search, Two Box Metal and Mineral Detector
F I S H E R R E S E A R C H L A B O R A T O R Y
Q U A L I T Y
Fisher detectors are renowned for their quality.
Each detector is hand crafted in the USA with pride
P E R F O R M A N C E
Treasure Hunters worldwide rely on Fisher.
Our detectors are durable, dependable, and search deeper..
R E P U T A T I O N
Fisher produced the rst patented metal detector in 1931. For
over 70 years, the Fisher logo has been a mark of excellence.
5 - YEAR LIMITED WARRANTY
Fisher believes in the products we produce and backs this belief
with a 5 year limited warranty.
Proof of purchase is required to make a claim under this warranty.
NOTE TO FOREIGN COUNTRY CUSTOMERS
This warranty may vary in other countries, check with your
distributor for details.
Factory warranty follows the channel of distribution.
Warranty does not cover shipping costs.
S E R V I C E
Fisher is committed to providing you, our valued customer, with
superior service. Each and every instrument is rigidly tested
and carefully inspected during assembly and before shipment.
Should you have any questions or problems, contact:
FISHER RESEARCH LABORATORY
1465-H Henry Brennan,
El Paso, Texas 79936
Tel 915.225.0333 Fax 915.225.0336
www.sherlab.com email:info@sherlab.com
FRL8703520000 042409

Fisher Labs Gemini-3 Specifications

General

Sensitivity Levels	Adjustable
Ground Balance	Manual
Battery	8 x AA
Depth Indicator	No
Target Identification	No
Search Modes	All Metal
Audio Output	Speaker, 1/4" headphone jack
Water Resistance	Not waterproof

Summary

About Your Detector

Basic Theory of Operation

Depth Capabilities

Factors Affecting Detection Depth

Details factors like mineralization, object size, burial time, shape, and operator skill influencing detection depth.

Transmitter Unit

Transmitter Controls and Indicators

Covers the Power Switch, Ground Plate Jack, and Battery Level Meter on the transmitter unit.

Receiver Unit

Receiver Controls and Indicators

Details Speaker, Meter, Sensitivity Control, Headphone Jack, Power Switch, and Battery Test Switch.

Searching Modes

Narrow Scan Inductive Search

Best for small objects; effective for pipes, cables, ore veins. Requires a single operator and 3-piece handle.

Wide Scan Inductive Search

Preferred for large areas; requires two operators. Ideal for long ore veins, pipes, or cables (40+ ft).

Tracing Modes

Inductive Trace

Used to trace long objects (pipe, ore vein) with no exposed portions but known starting points.

Conductive Trace

Best for tracing single pipes among others; requires direct connection via Ground Plate Assembly.

Prospecting Tips

Mapping Techniques

Outlining and staking conductive zones, plotting findings on maps, correlating with geology.

Locating Placer Deposits

Detecting associated black sand or iron sulphide to locate placer gold deposits.

Sources of Error

Common nonproductive zones of conductivity like mineral salts, rough terrain, fault zones, debris, and magnetite.

Battery Replacement

Treasure Hunters Code of Ethics

Usage Guidelines in the U.S.

Specifications

Using Headphones