Fisher F75 SPECIAL EDITION User Manual

Comprehensive Operating Manual & Guide to Metal Detecting

F75

LIMITED

SSPPEECCIIAALL EEDDIITTIIOON

Metal Detector

Users Manual

M75MBLK Rev. 2 122211

ACCESSORIES

Gold Prospecting Kits

Fisher Padded Carry Bag

Rugged double stitched construction. Includes handy exterior pocket for extra batteries or small accessories.

103693000C

Fisher Stereo Headphones

Use with Fisher metal detectors. Lightweight and adjustable with true stereo sound, adjustable volume, 1/8 jack with 1/4 adaptor, 4’ cable. 9720950000

Fisher Pin Pointer

Pinpoints the exact location of buried metal objects. Audio signal indicator and vibrator. Runs on 1 – 9-Volt Battery. FPOINT

Metal Sand Scoop

Large galvanized metal scoop with filtering holes. Strong Rubberized grip.

SAND SCOOP

Lesche Knife

Made from high quality heat-treated tempered steel. The ultimate digging tool. Comes with a durable sheath. 12" in length with a 7" serrated blade.

LESCHE KNIFE

Fisher Apron –

Natural canvas with 2 large pockets. FISHER APRON

Fisher T-Shirt –

100% cotton with

Fisher

Logo. Sizes – LG, XL & XXL

Fisher Baseball Cap –

One size fits all.

Replacement/Accessory Search Coils

11” Biaxial Standard Coil (replacement) - 11COIL-F75 10” Concentric Accessory Coil – 10COIL-F70

6.5” Concentric Accessory Coil - 6COIL-E 5” Biaxial Accessory Coil - 5COIL-F75

Coil Covers

Specially made to protect your coil from abrasion and damage.

11” Biaxial Standard Coil Cover – COVER-11DD 10” Concentric Accessory Coil Cover – F70COVER

6.5” Concentric Accessory Coil Cover- 6COVER-E 5” Biaxial Accessory Coil Cover - 5COVER-CZ3

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Comprehensive Operating Manual & Guide to Metal Detecting

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The F75 is a multipurpose metal detector. Its most popular uses are coinshooting

and relic hunting, and it is also well-suited to gold prospecting.

PRODUCT FEATURES

• Light weight and well-balanced: best ergonomically engineered detector in the industry.

• Intuitive menu-driven user interface

• Large LCD screen

• Visual indicators of important values such as:

Target Identification Target Confidence Target Depth (both running-depth and pinpoint-depth) Ground Mineralization

• Multiple Search Modes:

Discrimination Static All-Metal Motion All-Metal

• Trigger-actuated FASTGRAB™ ground balancing with manual override

• Waterproof 11-inch open-frame BiAxial™ searchcoil

Housing constructed of a carbon fiber-polycarbonate blend

• Trigger-actuated target pinpointing with variable audio pitch

• Fully Adjustable Arm Rest

• Display backlight for night and low-light conditions

• Notch and discrimination controls

• Covers provided for both the control housing and battery box.

• Made in the USA

If you have any questions, or need assistance with your metal detector, Call

1-915-225-0333, and ask for Fisher Hobby Technical Service

5-Year Limited Warranty

The F75 metal detector is warranted against defects in materials and workmanship under normal use for five years from the date of purchase to the original owner.

Damage due to neglect, accidental damage or misuse of this product is not covered under this warranty. Decisions regarding abuse or misuse of the detector are made solely at the discretion of the manufacturer.

Proof of Purchase is required to make a claim under this warranty.

Liability under this Warranty is limited to replacing or repairing, at our option, the metal detector returned, shipping cost prepaid, to Fisher Labs. Shipping cost to Fisher Labs is the responsibility of the consumer.

To return your detector for service, please first contact Fisher Labs for a Return Authorization (RA) Number. Reference the RAnumber on your package and return the detector within 15 days of calling to:

Fisher Research Labs, Inc.

1465-H Henry Brennan Dr.

El Paso, TX 79936

Phone: 915-225-0333 ext.118

Fax: 915-225-0336

Warranty coverage does not include the cost of transporting the detector back to an owner who is located outside of the United States of America.

NOTE TO CUSTOMERS OUTSIDE THE U.S.A.

This warranty may vary in other countries, check with your distributor for details. Warranty does not cover shipping costs.

According to FCC part 15.21 Changes or Modifications made to this device not expressly approved

by the party responsible for compliance could void the users authority to operate this equipment.

Published by Fisher Research Labs, Inc.

Fisher®is a registered trademark of Fisher Research Labs, Inc.

www.fisherlab.com

1465-H Henry Brennan Dr., El Paso, TX 79936 • (915) 225-0333

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Table Of Contents

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Quick-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Mechanicals

Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7

Mechanicals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Arm Rest adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Using Headphones (not included) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Introduction to the F75

General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12

Menu System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Ground Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-16

Motion All Metal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Static All Metal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Discrimination Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19-23

PinPoint Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

LCD Visual Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25-27

Numeric Target Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Probable Target Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Depth Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Confidence Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

3O4

Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Battery Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

G.B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..27

Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Frequency Shifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Capabilities & Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29-31

Tips & Techniques

Search Techniques

How to sweep the searchcoil . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Boost and Cache Locating Processes . . . . . . . . . . . . . . . . . . .32-33

Pinpointing targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33-34

Estimating target size and depth . . . . . . . . . . . . . . . . . . . . . . .34-35

False signals and chatter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Adjusting Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Tips on ground balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Detecting Activities

Coinshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Relic Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40-41

Gold Prospecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-42

Cache Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

Shallow Water Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-44

Saltwater Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

How metal detectors work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

Treasure Hunter’s Codd of Ethics . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Treasure Hunter’s Code of Ethics:

• Always check Federal, State, County and local laws before searching

• Respect private property and do not enter private property without the owner’s permission.

• Take care to refill all holes and leave no damage.

• Remove and dispose of any and all trash and litter found.

• Appreciate and protect our inheritance of natural resources, wildlife and private property.

• Act as an ambassador for the hobby, use thoughtfulness, consideration and courtesy at all times.

• Never destroy historical or archaeological treasures.

• All treasure hunters may be judged by the example you set; always conduct yourself with courtesy and consideration of others

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Specifications

Mechanical: S-rod with electronics housing mounted on handgrip, 3-piece

breakdown, batteries under elbow, 2-way armrest adjustment — forward/backward & around forearm.

Searchcoil: 11” (28 cm) open-frame elliptical double-D, waterproof. Batteries: 4 AA, alkaline (not included).

Weight: 3.5 pounds (1.6 kg) with alkaline batteries installed. Static Balance: force in vertical plane normal to elbow 0.47 pounds (0.22 kg).Varies

with adjustment and user’s stance and arm/hand physiology.

Dynamic Balance: axial moment, 0.29 foot-pounds (0.39 newton-meters). Varies with

adjustment and user’s stance and arm/hand physiology.

Sweep Effort: lateral moment 5.2 foot-pounds (7.1 newton-meters). Operating Principle: VLF induction balance Operating Frequency: nominal 13 kHz, quartz crystal timing reference

13158Hz, 13100Hz, 1043Hz, 12987Hz, 12931Hz, 12876Hz, 12821Hz

Basic Sensitivity: 6 x 109root Hertz (detectivity) Lag Coefficient: 78 milliseconds Reactive Overload: approximately 10,000 micro-cgs units (volume susceptibility)

40,000 micro-cgs units with sensitivity < 30.

Resistive Overload: approximately 1,200 micro-cgs units (volume susceptibility)

4,800 micro-cgs units with sensitivity < 30.

Ground Balancing Range: From ferrite to salt, inclusive Discrimination

Ground Suppression:

combination of second and third order methods

ID Ground Suppression: third order Battery Life: Typically 40 hours with high quality alkaline batteries

Estimated 80 hours with nickel oxyhydroxide batteries Estimated 65 hours with lithium iron disulfide batteries

Operating Temp Range: 4 to +122 degrees F (-20 to +50 degrees C) Operating Humidity Range:0-90% non-condensing

How Metal Detectors Work

Most hobby metal detectors use VLF Induction Balance technology. Here's how they work.

The searchcoil (also called search head or loop) contains two electrical induction coils which are like antennas. One coil transmits a rapidly alternating magnetic field,

illuminating the region surrounding the searchcoil. If metal is present, its electrical conductivity distorts the magnetic field. If iron metal is present, its magnetism also distorts the magnetic field, but in a different way, allowing the metal detector to distinguish between ferrous and nonferrous metals.

The other coil is a receiving antenna which detects changes in the magnetic field caused by the presence of metal. Electronic circuits amplify this weak signal, analyze it to determine the changes which occur as the searchcoil sweeps over the target, and then convey the information to the user in the form of a visual display or audio tones. Most modern metal detectors perform many of these tasks in software running on an internal microcomputer.

The iron minerals which are present in most soils also distort the magnetic field, obscuring the weak signals of small or deep objects. This can cause the object to go undetected, or to be misidentified when it is detected. Much of the technology that goes into modern metal detectors is devoted to the task of eliminating the unwanted signals from iron minerals in the soil, while not losing the signals from metal objects.

This device has been designed to operate with the antennas listed below, and having a maximum gain of 3 dB. Antennas not included in this list or having a gain greater than 3 dB are strictly prohibited for use with this device. The required antenna impedance is 53 ohms.

10COIL-F70, 11COIL-F75, 5COIL-F75, 6COIL-E

The following statement is not relevant to metal detectors but is printed here to satisfy legal notification requirement:

“To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that permitted for successful communication.”

The following countries allow free movement of this product within the European community: FIN,LVA,SVN,SUI,BIH.

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Quick Start

Use your F75 right out of the box

1. Assemble the detector (see instructions beginning page 4). 2 Install four AA

alkaline batteries. All positive (button-end) terminals point up.

3. Turn the knob, located under the armrest, fully clockwise.

This turns the machine on and sets audio volume to maximum.

4. When first turned on, the

F75 starts out in the Discrimination mode, with: Sensitivity preset to 60 Discrimination Level preset to 15 Number of Tones preset to 3 Process# preset to dE

Sweep the searchcoil from side to side, parallel to the ground. Keep the searchcoil moving over the ground. If you stop moving the searchcoil, the sound will also stop. Probable target type will be indicated at the top of the LCD screen.

5. If the searchcoil is not in motion and not close to metal, the detector should be silent.

6. If you experience false signals from electrical interference, from the soil itself, or from lots of trash metal, press the MENU button.

Sensitivity will be highlighted. Rotate the

Settings knob to the left (counterclockwise), Reduce the sensitivity setting until the false signals go away. After 7 seconds, the machine will exit the menu and return to

normal operation.

7. Find a patch of ground free of metal, toss a coin on the ground and sweep back and forth over it a few times to get a feel for how the machine responds.

8. You are now ready to search.

9. Pull and hold the trigger switch with your index finger to pinpoint the exact location of targets, making them easier to unearth.

When the trigger is pulled, PinPoint is engaged ….

The searchcoil need not be in motion to detect an object. The 2-digit numeric display indicates approximate target depth, in inches.

When searching on a beach, it is best to either search in Motion All Metal mode, or to search with the discrimination level set just high enough to eliminate iron, because the value of beach finds is largely in the jewelry rather than in the coins. You will dig a lot of aluminum trash, but the digging is easy, and you can tell people that you are helping to clean up the beach and make it safer for people's feet. We recommend the use of a special

sand scoop for recovering

valuables from the sand quickly -- most metal detector dealers sell these. The electrical conductivity of the water itself can pose some challenges. You may get false

signals when going into and coming out of the water, making it necessary to pay careful attention to keep the coil either in or out of the water, but not to touch the surface. This effect may be observed in either fresh or saltwater.

Saltwater Hunting

Saltwater is highly conductive, and produces a strong signal which is like that of metal. The

F75 is not specifically designed for high performance in saltwater, but can be used in this

environment. If you desire to search in or over saltwater, the following measures will usually be sufficient to

silence the saltwater response while retaining acceptable sensitivity:

1. Set the

sensitivity in both modes to less than 30.

2. Ground balance the machine manually in Motion All Metal mode.

3. Search in the Discrimination mode with a discrimination setting higher than 25.

Detecting Activities (continued)

Shallow Water Hunting (continued)

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Assembly

1. Remove all components from box.

2. Attach

searchcoil to lower rod by

lining up the holes.

Push

coil knob through hole

and tighten knob gently.

You will tighten up the coil knob later.

3. Insert smallest rod into S-rod

(S-rod holds detector body).

Turn

top locking collar

counter-clockwise to open up. Push in pin on small rod. Slide small rod into upper rod. Click pin into hole and tighten locking collar firmly clockwise.

4. Push

lower rod into small rod

as follows:

Turn locking collar counterclockwise to open up. If plastic insert tab interferes, push it down, or turn tube upside down. Push in pin to allow rod to slide in. Slide lower rod in. Click pin into any hole.

5. Remove

velcro strip from lower rod.

6. Wrap

cable around stem as follows: Leave some slack in cable at base of lower rod. Secure cable at base of rod with velcro strip. Wrap cable loosely around entire stem up to bent part of upper rod.

You will re-wrap the cable later after sizing the rods to your height.

Release Clip

Battery Compartment

Hand-grip

2-way adjustable armrest

On/Off & Volume Switch

Menu Botton

Headphone Jack

Search Coil Cable

Settings Switch

Upper Stem

Biaxial Searchoil

Dual-function Tri gger switch

S-Rod

Cache Hunting

A cache (pronounced "cash") is an accumulation of money, jewelry, gold, or other valuables, which someone has hidden. When people bury a cache, they usually put it in a strongbox or in a jar. To search for a cache, you first need a reason to believe the cache may exist. This means doing research. Some caches have been the subject of many stories you can read about in print, but you need to be able to sort fact from fiction. If you can get copies of old newspaper stories about the circumstances surrounding the hiding of the cache, you may find discrepancies which help you to judge the reliability of the information available. Often the best information on an old cache is to be learned from old timers who live in the area where the cache is thought to be. In the case of newer caches, often the only information is what can be obtained from family and acquaintances of the person who is believed to have hidden the cache.

The ownership of a cache is not always clear. Sometimes it belongs to the person or heirs of the person who hid it, sometimes it belongs to the owner of the property on which it is located, and sometimes it belongs to the person who finds it -- or some combination of the above. If the contents of the cache were stolen, this fact can also complicate the question of ownership. Find out what laws apply to the cache in question, and always make sure that the issue of ownership is resolved prior to recovering a cache.

Compared to a coin, a cache is usually large and deep. Searching in Motion All Metal mode is recommended. However, for a really deep cache, it may be advantageous to search in STAT mode, frequently pulling the trigger momentarily to maximize sensitivity.

Shallow Water Hunting

All Fisher Research Labs searchcoils are waterproof, allowing you to search in shallow water about two feet deep. If searching around water, be careful not to get the electronics housing wet. Avoid salt spray, as it will work its way into the control housing and damage the electronics -- such damage is not covered by the warranty.

Both fresh and saltwater beaches are popular places for metal detecting. Vacationers lose money and jewelry playing in the sand and in the water. It is usually easy to dig in a beach environment, and metal detecting is permitted on most beaches. Occasionally you may be able to help someone recover a piece of jewelry they have lost minutes before; this is a gratifying experience.

Detecting Activities (continued)

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7. Push cable into connector on back of housing.

Do not twist the cable or plug.

8. Tighten knurled cap nut by hand to secure cable connection to housing.

Use minimal finger pressure to start thread. Do not force threads. Nut may not completely cover all threads when fully engaged.

9. Adjust to your height: Hold detector, standing up, with your arm in the armrest. Place searchcoil flat on the ground with back edge of coil 6” in front of your toes. Click pin on lower rod into nearest hole. Firmly tighten bottom locking collar to secure lower stem.

10. Attach cable to top of rod with upper Velcro strip

11. Tighten up coil knob to keep searchcoil from flopping.

12. Insert batteries. 4 batteries are all installed the same way -- positive terminals pointed upward.

After establishing a comfortable length, firmly tighten the locking collars on the rods to prevent the tubes from rattling. Rotate the collars a full 270° to engage and lock in place. If you are unable to rotate a full 270°, use gloves for a better grip.

If the searchcoil appears crooked with respect to the pole, loosen both locking collars and re-adjust. Hold each of the lower poles in the counterclockwise position as you tighten the locking collars.

Assembly (continued)

minerals, serious gold prospecting requires a detector with high sensitivity

and true ground balanced motion all metal operation. Run the

machine with the sensitivity high enough to hear some noise

from ground minerals, and

learn the language of the

sounds you hear. Headphones are recommended

unless consideration for safety (for instance

rattlesnakes) rules them out. Move the searchcoil

slowly and deliberately, carefully controlling its

height above the ground to minimize noise from

iron minerals in the soil. If you hear ground

noise, your Ground Setting could be a bit

off, so perform the ground balancing

procedure again. As you walk even a very short distance, ground conditions

can change. The ground geology typically associated with gold will tend to change over very short

distances.

The Fe

3O4

bar graph indicates the amount of iron mineralization in the soil. In most gold fields, especially alluvial (placer) deposits, gold tends to be associated with iron minerals, especially magnetite

black sand. If you know this to be the case in the area

you're working, you can maximize your gold recovery by

concentrating your effort on areas where the bar graph

indicates higher amounts of iron mineralization.

Gold prospectors are mostly a friendly bunch, and willing to

spend some time showing a beginner how to increase his odds of finding the yellow stuff. Many will invite you to search

on their claims (if they have any) once they get to know you.

In some gold areas, a lot of the terrain is under claim, so you need to learn how to recognize posted claims and stay off of them unless you have the claim owner's permission. Prospecting clubs such as the GPAAoften own claims which are open to their members, and sponsor group outings to good

gold areas.

It’s a thrilling experience to dig into the ground and pull out a precious piece of yellow metal that you are the first person on earth to see. If you love being outdoors, have patience, and can stay motivated by the prospect of finding that next nugget, then

beeping for gold may be the hobby for you. While only a few get rich prospecting, if you are not among them, think of it as outdoor recreation where your finds defray the expense of having fun!

Detecting Activities (continued)

Gold Prospecting (continued)

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Mechanicals

BATTERIES (not included)

The F75 requires four AAbatteries. These

non-rechargeable chemistries may be used: Alkaline, Nickel Oxy-Hydroxide (Panasonic Oxyride or Duracel PowerPix), and lithium iron disulfide (Energizer L91). Nickel metal hydride and nickel-cadmium

rechargeable chemistries may also be used.

Zinc-carbon and so-called “heavy duty” batteries may not work, especially in cold weather. Do not use these batteries.

Expect 40 hours of service in the field with one set of alkaline batteries. Rechargeable batteries will usually deliver over 25 hours of service without recharging, but when they start running low, they die suddenly with little warning.

Always install batteries which are of the same type and the same state of charge. Otherwise battery life will be determined by the weakest battery, because the good batteries cannot deliver their power with a dead battery blocking the current.

All 4 batteries are installed with the

positive terminals facing upward.

The LCD screen shows battery condition on the right.

RIGHT WAY WRONG WAY

IMPORT ANT:

T o avoid stressing the battery spring connection, install the batteries using this technique:

1. Position the bottom (negative) side of the battery on top of the spring.

2. Do not install the top of the battery into the compartment yet.

3. Push down on the battery to compress the spring.

4. With the spring compressed a bit, then tip the battery upright and push back into the compartment.

or documentation, their context will be lost. The ground balancing and Fe

3O4

bar graph features of the F75 can be used to map the soils of a site. In this way you might determine which areas have been dug, backfilled, or subjected to fire. This information in turn helps to reveal the history of the site.

To find promising sites to hunt, conduct research at your local library, look for clues in old newspapers, and seek information on the internet. Where did buildings used to be? Which have since been torn down? Where did people gather for public events like dances and county fairs? Where did train and stage lines run? Where were the swimming holes? In almost every town there is a historical society and museum of local history. Most museums are grateful for anything they can put on display, and when you dig something you cannot identify, the curator can often identify it for you. If you work closely with the local historical society or museum, landowners will be more willing to grant you permission to search their property.

Some of the most promising sites for relic hunting are places being cleared for development. After the site is built on, whatever is in the ground will become inaccessible. The property owner can often be persuaded that the site should be searched immediately while it is still searchable.

Gold Prospecting

In the United States, gold is found in many places in the western states, Alaska, and in a few localities in the Appalachians. The old saying "Gold is where you find it", means that to find gold, you should look in areas where the yellow metal is known to be present.

Hillsides are the best areas for gold prospecting using a metal detector, because hillsides cannot be cleaned out by panning and dredging the way streams can. Also, gold on hillsides, not far from its source vein, tends to be larger, and hence more readily detected, than alluvial (placer) gold which tends to get pounded to pieces and worn away as it rolls along the streambed with gravel during floods. Gold is valuable because it is a scarce commodity. Even in a good gold producing area, you will often spend an entire day without finding any gold. Meanwhile you will dig bits and pieces of other metal-- birdshot, shells and bullets from hunting and target practice, bits of rusted barbed wire, chips off shovels and other mining tools, rusted tin cans, etc. Hot rocks -- rocks containing concentrations of iron oxides that sound like metal when you pass over them -- are also a nuisance in many gold areas. Discrimination is usually ineffective because the loss of sensitivity resulting from discrimination is enough to cause those little nuggets to vanish. If you have gone many hours without finding gold and are wondering if there is something wrong with your metal detector or how you are using it, the most important clue is this: if you are digging

tiny pieces of trash metal, then if

gold were present you would have found small gold pieces too! Because most gold nuggets are tiny, and are usually found in soil which is high in iron oxide

Detecting Activities (continued)

Relic Hunting (continued)

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Fisher F75 SPECIAL EDITION User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual