Tesoro VAQUERO Assembly instructions

VAQUERO OPERATOR INSTRUCTION MANUAL
CONGRATULATIONS!
Your new Tesoro Vaquero metal detector is part of a new series of detectors designed to provide
you with many happy hours of enjoyment in the most rewarding hobby I can think of—treasure
hunting. Ahead of you lie fascinating and exciting experiences as you step into the past—
uncovering artifacts lost by past generations, or as you take pleasure in the great outdoors with
family and friends searching for precious metals. I wish we could share these experiences with
you, and all of us at Tesoro wish you the best of success.
Your Tesoro detector is capable of meeting your needs in a wide range of treasure hunting
situations. As with any other metal detector, familiarity with this instrument is probably the
limiting factor in determining how successful you can be. I recommend that you read this manual
and fully understand how to operate this detector before attempting to use it in the field. As you
become more familiar with your detector through practice, your rate of success will increase
dramatically.
The Vaquero is a precision electronic instrument that will last for years if properly cared for.
Treat it right and it won’t let you down.
Good Hunting! Jack Gifford
GETTING STARTED - UNPACKING THE BOX
Your Vaquero was shipped with these parts:
1 Upper Pole Assembly
Fully assembled, including upper pole stem with handle grip, padded arm bracket, and control
housing.

1 Middle Pole Assembly With Pole Lock
1 ABS Lower Pole Assembly
Fully assembled, complete with two friction washers, mounting screw, and thumb nut.
1 9 x 8 Monolithic Searchcoil With 3’ Cable and Scuff Cover
1 9 Volt Alkaline Battery
1 Operator Instruction Manual
1 Warranty Card
If any of these items are missing, immediately contact the Tesoro Authorized Dealer where you
purchased your detector.
Assembly of the Vaquero is simple and requires no special tools. Just install the battery, mount
the searchcoil on the lower pole assembly, connect the pole assemblies together, wrap the excess
cable around the pole and, plug the cable into the control housing. Finally, adjust the pole length
and searchcoil angle and you're ready!
INSTALLING THE BATTERY
Your Vaquero is equipped with a battery test switch so that you can always be sure you are
getting top performance. (See QUICKSTART for operation.) The battery should be checked
after the detector has been on for about 10 minutes and then periodically when used for long
durations.

To install or replace the battery, first make sure the SENSITIVITY control is set to POWER
OFF—turned completely counterclockwise past the “click.” Remove the battery door from the
back of the control housing. Do this by pressing your thumb firmly on the louvered square—at
the bottom of the battery door—and sliding the battery door upward in the direction of the arrow.
Check the polarity on the battery and on the diagram inside the battery compartment. Make sure
that they match and simply drop a fresh 9 volt alkaline battery into the compartment. Note: If the
battery is not installed properly, damage may occur to your detector.
Replace the battery door by sliding it into place making sure the upper mount slots are in line and
the lock tongue is snapped in place.
ASSEMBLING YOUR DETECTOR
1. On the lower pole assembly, remove the mounting screw, and thumb nut from the pole
tip.
2. Insert the pole tip between the mounting ears of the searchcoil and align the holes of the
pole tip and washers with those of the mounting ears.
Note: The pole tip should fit very snugly into the mounting ears.

3. Insert the mounting screw through the holes in the mounting ears and pole tip—entering
from the side opposite the cable connection.
4. Install the thumb nut on the mounting screw and tighten by hand.
Note: Do not overtighten the thumb nut. It should be snug but not too difficult to
loosen up.
5. On the middle pole assembly, depress the two spring buttons and slide the middle pole
assembly into the upper pole assembly until the spring buttons click into the holes,
locking the two assemblies into place. Tighten the pole lock to secure the two assemblies
together.
6. Slide the lower pole into the middle pole until spring buttons click into the first set of
adjustment holes. Turn pole lock to tighten the assemblies into place.
7. Wrap the cable around the pole leaving enough slack near the searchcoil to permit
searchcoil adjustment.
Note: Do not allow the cable to flop loosely over the searchcoil. Since the detector is
sensitive enough to “see” the tiny wires in the cable, a floppy cable can cause false
signals as the searchcoil senses the moving wires.

8. Plug the male cable end into the female connector on the control housing and tighten the
cable thumb nut. You are finished!
Note: You will want to adjust the pole length and the searchcoil angle to your
preference.
ADJUSTING THE POLE & SEARCHCOIL
The pole length should be adjusted so that the detector does
not become uncomfortable or tiring after long periods of use.
The detector grip should rest in your hand with your arm
relaxed, your elbow straight but not locked, with the pole
extending out in front of you at the approximate angle shown
in the photo.
You should be able to swing the detector back and forth in
front of you—using relaxed shoulder movement—while
keeping the searchcoil as close to the ground as possible. This
swinging movement is often called a “sweep.”
The searchcoil should not touch the ground during your
sweep. The pole length should be adjusted to allow this
without having to lift the detector with your elbow or
shoulder. The searchcoil should rest about one inch above the
ground while you are standing erect. The angle of the
searchcoil should allow the bottom to be parallel to the
ground.
The pole length is adjusted by loosening the pole lock, then
depressing the spring buttons and extending or shortening the
pole until the spring buttons click into the set of holes that
give you the most comfortable pole length.

To adjust the searchcoil angle, simply loosen the searchcoil thumb nut slightly and move the
searchcoil into the desired position. Tighten the searchcoil thumb nut by hand so that the
searchcoil will hold in place.
QUICKSTART - SELF-GUIDED TUTORIAL
The Quickstart is designed to teach you how to use your new Vaquero. It provides a quick and
easy means of learning your detector and the concepts behind all of the functions.
You will need the following items:
1. Your fully assembled Vaquero.
2. An iron target (a small nail or screw will do), a nickel, a quarter, and a couple of different
pulltabs.
3. A nonmetal table top or counter.
Here’s what you will do:
1. Perform Audio Battery Test.
2. Adjust THRESHOLD.
3. Adjust GROUND BALANCE for Air Test.
4. Perform Air Test in ALL METAL Mode.
5. Adjust SENSITIVITY.
6. Perform Air Test in DISC Mode.
7. Perform Air Test in PINPOINT Mode.
8. Super Tune Your Vaquero.
9. Adjust FREQ Switch.
Prepare for the Quickstart
Place your assembled Vaquero on the nonmetal surface. Make sure that there are no metal
objects near the coil and remove any jewelry from your hands and wrists.

Start with the controls like this:
1. THRESHOLD and SENSITIVITY knobs turned completely counterclockwise.
2. DISCRIMINATE LEVEL knob turned completely counterclockwise and clicked into the
ALL METAL Mode.
3. GROUND BALANCE knob at the 12 o'clock position.
4. FREQ switch in the center position.
Perform Audio Battery Test
Turn the SENSITIVITY knob from OFF to about 7 or 8. You will hear a series of quick beeps. If
the battery is fully charged, you will hear 6 or 7 beeps. When you hear only 1 or 2 beeps, it will
be time to replace your battery. This test is only performed when the detector is first turned on. If
you would like to check the condition of your battery while hunting, turn your detector off and
on again and listen to the beeps.
Adjust THRESHOLD
To adjust the threshold tone, turn the THRESHOLD knob clockwise until you hear a slight but
steady tone. You will have to turn the knob to somewhere between the 10 o'clock and 3 o'clock
position to get the best hum.
The purpose of the threshold tone is to give a reference to judge targets for pinpointing, to adjust
the ground balance (for more information on ground balancing, see the “Adjust GROUND
BALANCE for Air Test” section and the “Ground Balancing in the Field” section) and to super
tune the Vaquero. (For more information on super tuning, see the “Super Tune Your Vaquero”
section.)
In the field, some targets may be small enough or deep enough that they will not be able to
generate an audio signal by themselves. By monitoring a threshold tone, you already have a
slight audio tone so changes are easier to hear. However, if your threshold tone is set too soft or
too loud, small changes in the signal will be hard to hear. Take some time and find a threshold
level that is right for you.
Adjust GROUND BALANCE for Air Test
The ground balance function for your Vaquero is a form of discrimination that allows you to tune
out the mineralization in the ground that may mask targets or decrease the detector’s depth and
sensitivity. The GROUND BALANCE knob is on a 3 and ¾-turn potentiometer. While the knob
will turn endlessly in either direction, when the knob is at the end of its range, a slight drag will
be felt while turning.
The following procedure is for the air test only. For directions on ground balancing your
Vaquero in the field, see the “Ground Balancing in the Field” section.

To set the GROUND BALANCE knob for the air test, turn the knob 5 turns counterclockwise
and then turn the knob 2 turns clockwise. This will make sure the GROUND BALANCE knob is
just slightly above the middle part of its range. No further turns will be needed for the air test.
Perform Air Test in ALL METAL Mode
Once you have set the correct threshold hum and adjusted the ground balance, you are ready to
perform an Air Test in the ALL METAL Mode. Your Vaquero has a VCO-style ALL METAL
Mode. You will find that as targets get closer to the coil, the threshold tone will get louder and
higher in pitch.
Try waving your targets in front of the coil. Start from a distance of 10 to 12 inches away from
the coil and slowly work your way closer to the coil. Then try starting from 6 inches away from
the left or right of your coil and work your way to the center of the coil. Notice the changes of
the audio signal. Your strongest signal will always be closest to the center of the coil. Additional
information can also be learned by the signal strength and pitch. A smaller or deeper target will
give a less noticeable change in the threshold than a larger or shallower target will give.
Your Vaquero is equipped with an automatic Threshold Retune circuit in the ALL METAL
Mode. While searching in the ALL METAL Mode, the circuit is constantly adjusting the
threshold to maintain the steadiest possible audio tone. The Threshold Retune circuit can also be
used to help the pinpointing of targets. Hold any target over the coil somewhere between four
and six inches away from the coil. You will get a strong audio target signal. After a few seconds,
the audio signal will drop to the preset threshold level. When this happens, move the target one
or two inches to either side of the center of the coil. You will notice that the audio signal will go
silent or null and that the target will only beep directly over the center of the coil. When this
technique is used in the field, it will simplify your ability to quickly pinpoint your target.
Take some time and try all of your targets at different depths to find out how your detector
sounds.
Adjust SENSITIVITY
We are now ready to switch the detector into the DISCRIMINATE mode. Go to the
DISCRIMINATE LEVEL knob and turn it slightly clockwise until it clicks. You will notice that
the threshold hum will stop. The discriminate circuit uses a silent search mode, meaning that no
sound will be heard until the coil goes over a target. The most common use of the detector is to
hunt in the DISCRIMINATE MODE and push the PINPOINT button to pinpoint a target. This
will give you that advantage of ignoring unwanted targets and not having to listen to the
threshold hum until you are ready to pinpoint and dig a target.
The all metal circuit uses a single channel to detect various metals. The discriminate circuit uses
two different channels, then amplifies and filters them. The detector will then compare the
signals and determine whether or not to beep at the target. While there is a great advantage to
ignoring unwanted targets, it can make the circuitry more susceptible to interference. A number
of outside conditions such as power lines, highly mineralized soil, and wet salt sand can cause
interference.

The SENSITIVITY knob is used to raise or lower the power to the operational amplifiers, which
changes the gain. Gain is a measurement of how much a signal is amplified. The higher the gain
the more depth and sensitivity to small objects a detector has. Unfortunately, any small
interference that is amplified can cause the detector to become erratic. The SENSITIVITY
control is used to find the best gain setting in any location without letting the detector become
unstable.
Take some time to try waving targets in front of the coil with different sensitivity settings. Notice
that the higher the sensitivity setting, the farther away from the coil that a target can be and still
respond with an audio signal.
Perform Air Test in DISC Mode
As discussed before, the DISCRIMINATE Mode is used to filter unwanted targets from good
targets. The principle behind this is pretty simple. The detector sends out a signal and then
receives it back creating a small electronic field. As metal passes through the field that the
detector generates, it causes a change in the received signal. The amount of change that each type
of metal causes is fairly constant; therefore, we can tune our detectors to miss targets that we
don't want to find. The change is based on the type of conductivity that each target has. The
general list of conductive targets is as follows: iron, foil, nickels, gold jewelry, pulltabs, screw
tabs, pennies, and silver coins starting with dimes and working up to silver dollars. This list is
only meant to be a guide. There is a point that some pulltabs, nickels, and gold jewelry overlap.
Also, the depth of the target and its orientation in the ground can change the received signal. A
coin that is flat to the coil will produce a better signal than a coin that is on edge. Take some time
to try different combinations of depths and orientations of your targets and find out how your
detector responds.
We are now ready to discriminate targets from each other. We will start with the
DISCRIMINATE LEVEL at MIN. Please notice that the DISCRIMINATE LEVEL knob has
words that correspond to the items that are discriminated out.
All four targets (the iron, nickel, pulltabs, and quarter) will respond with a good audio signal at
the MIN setting. Next, we will turn the DISCRIMINATE LEVEL up to or just slightly past the
IRON level. This should be high enough to knock out the iron target and still get a positive
response on the nickel, pulltabs, and quarter. When you are done, turn the DISCRIMINATE
LEVEL to around the 5¢ setting. This level is high enough to knock out the nickel. At this time,
the iron target and the nickel should give no response, while most of the pulltabs and the quarter
will give a solid response. Next, turn the DISCRIMINATE LEVEL knob just past the TAB
marking. At this time, most or all of the pulltabs should not give any audio signal. Only the
quarter should give a strong signal. Now, roll the DISCRIMINATE LEVEL all the way to MAX.
Notice that the quarter is still responding. The discrimination will not go high enough to lose
most of the silver coins.
This air test was designed to quickly show you how your discriminate mode works. Each
machine may be a little different from all of the others, so you may want to take some time and
try different targets to find responses of your machine. At a later date, you may want to build a
test garden to test your detector in the field.

Perform Air Test in PINPOINT Mode
When you are hunting in the DISCRIMINATE Mode, the PINPOINT button will allow you to
momentarily switch back into the ALL METAL Mode. The PINPOINT button is springloaded
and must be pressed and held to shift into the ALL METAL Mode.
At this time, you should be in the Silent Search Discriminate Mode. Press the PINPOINT button
and you will immediately hear the threshold audio tone. This indicates that you are now in the
ALL METAL Mode. Hold the button in and check your targets. They will respond like in the
ALL METAL air test.
Take some time to try different discriminate levels and then check them with the PINPOINT
Mode. You will notice some distinctly different tones. Practice and experience will give you
large amounts of information that will help you decide whether or not to dig a target in the field.
Super Tune Your Vaquero
The Vaquero can be set up to get even better depth and sensitivity while operating in the
DISCRIMINATE Mode. Super tuning is accomplished by working in the DISCRIMINATE
Mode and turning the THRESHOLD knob to the highest setting.
Super tuning your Vaquero will cause the threshold audio level to be set too high for accurate
All Metal or Pinpointing operation.
To start, turn the DISCRIMINATE LEVEL knob to just above the IRON setting and turn the
SENSITIVITY knob as high as it will go without causing the detector to chatter. Check a target
or two and notice how far away you can get from the coil and still receive a repeatable audio
signal. Now, turn up the THRESHOLD knob and recheck the targets. You should see an increase
in the distance from the target to the coil. Push the PINPOINT button. Notice that the threshold
tone is far too loud to accurately identify some of your targets.
When hunting with a super tuned Vaquero, you should ground balance the detector with the
threshold tone set at the level of a low steady hum. After you have ground balanced, you can turn
up the THRESHOLD knob to super tune your detector.
Take some time to try different targets and settings in an air test to see how well your detector
will work in the ground.
Adjust FREQ Switch
Your Vaquero comes equipped with a frequency shift switch (FREQ1, FREQ2, and FREQ3).
This switch is used to change the operating frequency of your detector. This ability will help you
to work a larger number of areas. The most common use would be during a large hunt where
another hunter has the same frequency machine as your detector. Two machines that are on the
same frequency will start broadcasting to each other. This is called crosstalk. If you experience
crosstalk in the middle of a hunt, just flip the FREQ switch to another setting. This is very easily
done and can be done in the middle of a sweep. Changing the frequency can also help in some

urban areas where there may be a high concentration of radio or cell phone traffic. If your
detector is acting erratically after adjusting the SENSITIVITY and GROUND BALANCE, try
shifting the FREQ switch and resetting the SENSITIVITY and GROUND BALANCE.
Changing the operating frequency will not change the audio frequency of the signal in the
speaker. The audio frequency is controlled by a microprocessor and will not shift.
Conclusion
Congratulations, you have just finished the Quickstart for your new Vaquero detector and in the
process have learned quite a lot about your detector. But experience is the best teacher. I would
recommend that you get out and practice with your detector as much as possible. Any time spent
using your detector will give you valuable experience.
OPERATING TECHNIQUES
Ground Balancing in the Field
Ground balancing is not a difficult procedure, but it is critical if you desire maximum depth and
stability. It is especially important if you plan to find deep relics or prospect for gold nuggets.
No matter how or where you will be hunting, or whether you will be hunting in the All Metal or
Discriminate Mode, you must tune the ground balance for the area that you will be hunting. If
you fail to ground balance for every site, you will not be working at the peak of your detector's
performance and may lose both depth and sensitivity.
To ground balance in the field, we will start by assuming your detector is turned off. This will be
the normal condition of your detector when you start hunting. Ground balancing can be done at
any time while you are using the detector. It is not necessary to turn the machine off each time
that you ground balance.
Start with the controls in the following position:
1. SENSITIVITY on OFF.
2. DISCRIMINATE LEVEL clicked into the ALL METAL.
3. All other controls will be set during the ground balancing procedure or are not applicable
at this time.
Turn the detector on by rolling the SENSITIVITY knob clockwise to about 9 or 10 on the dial.
You will hear a quick double beep to let you know the detector is operating. Next, adjust the
THRESHOLD knob until a slight, steady hum is heard. The machine is now ready to be ground
balanced. Next, find an area that has no metal targets in the ground, as this may give false
readings while in the ground balance procedure.

Raise your searchcoil about 6 to 8 inches off the ground. This is high enough so that the detector
will no longer read the minerals in the ground. While listening to the threshold sound, lower the
searchcoil to about 1 inch off the ground. As the coil is dropped, the detector will start to read the
ground minerals and will give you one of three sounds: 1) The threshold tone will get louder and
raise in pitch. This is a positive response; 2) The threshold tone will go quiet, followed by a
quick tone. This is called a negative response; 3) There will be no change in the threshold tone as
the coil is dropped. This is the balanced response. When you get a balanced response, the
detector is telling you that it is ready to hunt.
The positive and negative responses are easy to adjust. If you get a positive response, turn the
GROUND BALANCE knob towards the minus sign on the face or in a counterclockwise
direction. Getting a negative response means turning the GROUND BALANCE knob towards
the plus sign on the faceplate or in a clockwise direction.
Here is an example of balancing: After setting up the detector, you raise the coil and then push it
to the ground. As the coil drops, the threshold hum gets louder. You then turn the GROUND
BALANCE knob counterclockwise towards the minus sign. You pick up the coil and push down
again. This time you get a slight negative response. Turn the GROUND BALANCE knob a little
bit towards the positive or in a clockwise direction. When raising and lowering the coil, the
threshold makes no change as the coil is dropped. At this point the detector is balanced for the
area and is ready to hunt.
Ground balancing is a learned skill, one that you should practice often. AVOID THIS! Never tilt
your searchcoil when "pumping" your detector to ground balance. It is easy to practice almost
anywhere—your front or backyard, a local park or a fair-sized flower garden. When you are
practicing, make sure that there are no pieces of metal underneath your coil that may cause a
target sound.
Please remember that the coil must be lifted straight off of the ground. Swinging the coil in an
arc, like a pendulum, will cause false readings and will result in an improper ground balance.
Handling Your Detector
The detector should be held in a position that is comfortable for you as shown in the “Adjusting
The Pole & Searchcoil” section in GETTING STARTED. Swing the detector from side to side
in about a three foot arc, overlapping succeeding strokes well. This motion is called a “sweep.”
The Vaquero is designed to get maximum depth without the frantic pace required of earlier
motion detectors, so go at a pace that is comfortable for you. In fact, trying to hunt too fast may
even cause a loss of depth in heavily mineralized locations.
Regardless of which mode you are using, try to keep your searchcoil height constant and close to
the ground. Most people tend to raise the coil at the end of a sweep—much like a pendulum—
especially if they are in a hurry. Try to avoid this as any increase in height from the ground will
cause a corresponding loss of depth.
In areas with well-kept lawns, the easiest way to maintain a constant searchcoil height is to allow
the coil to rest on the grass as you sweep from side to side. In rough and rocky areas, it is best

not to “scrub” the coil on the ground, as the rocks will act like abrasives and wear away the coil
bottom (an scuff cover will protect against this). Sweep the coil as close to the ground as possible
without touching. Hitting the ground or rocks may cause a false signal, much like a desired target
would. Sweeping the coil too high above the ground results in a loss of depth.
Pinpointing a Target
When pinpointing a target, the ALL METAL Mode can offer advantages over the
DISCRIMINATE Mode, such as no false signals and no need to move the searchcoil to get a
target response.
A good method for pinpointing in ALL METAL Mode is “X-ing” the target with the searchcoil.
Remember that the target's response sound is always greatest when the target is directly under
the center of the searchcoil. To “X” a target, sweep the searchcoil over the target from side to
side and then from front to back until you can identify the center of the X—the spot on the
ground where the target response sound is the greatest.
Pinpointing a target in the DISCRIMINATE Mode is probably best done by “X-ing” as well.
Remember that the detector will beep just as the target passes under the center of the searchcoil.
Slowing the sweep speed down will help you pick out the center of the X because the target
response is reduced at very slow speeds making it easier to correlate the sound with the coil
center.
Another easy method is to sweep the coil from side to side across the target in very short sweeps
as you slowly move forward and backward across the target. Slow down the sweep rate and
shorten the sweeps until you just barely get a response at one spot. The target will be directly
below the coil center at this response time.
Another method of pinpointing in the DISCRIMINATE Mode is to quickly change to the ALL
METAL Mode to check the target response. Remember that all metal mode is not susceptible to
the false signals of the DISCRIMINATE Mode and can sometimes give a clearer and more
consistent response to difficult targets such as a dime buried next to a pulltab. By switching back
and forth between modes and comparing the target response sound in all metal to the target
response sound in discriminate, you can often better identify the likely location of the target.
Finally, raising the searchcoil during pinpointing can also help by narrowing the response to the
target. Practice pinpointing often, and you will soon become more accurate and faster.
Planting a Test Garden
To better learn how your detector will perform in the field, it would be helpful to bury some
coins and trash metal junk items in an area that you know is clear of other metal objects, and then
try the Vaquero in the ALL METAL & DISCRIMINATE Modes. Check the area in ALL
METAL Mode to be sure it's clear of trash. Then bury the targets at least 1 foot apart and from 2
to 4 inches deep to start. Make a map of the area to be sure you know what each target is and
how deep it is. Practice on these targets to familiarize yourself with your detector’s target
response. This will also help you learn the proper sweep speed for best operation. This type of

practice area is often called a “test garden” or “test bed” and is one of the best tools to help you
develop your metal detecting skills.
RECOMMENDED RECOVERY METHODS
CARE AND USE
Basic Care
The Vaquero is a sturdy instrument, but it is not designed to withstand abuse. In caring for your
Vaquero there are several important “DO NOTs” to remember. DO NOT use it to pry rocks
loose or to beat bushes out of the way. DO NOT drop the machine into water. DO NOT use it
unprotected in the rain. DO NOT leave it exposed at night where dew could form on it. DO NOT
store it in places that could get extremely hot (next to a woodstove, in an attic). DO NOT leave it
in the trunk of a car or in the back of a hatchback-style car where high temperatures could build
up. DO NOT store it with the battery installed as batteries may leak. DO NOT spray lubricants
such as WD-40, or any type of cleaners, solvents, sealants or other chemicals into or onto the
electronic parts, switches or controls. And finally, DO NOT attempt to modify or repair the
detector’s electronics as this will void your detector's warranty.
THE WARRANTY DOES NOT COVER DAMAGE RESULTING FROM AN
ACCIDENT, NEGLECT OR ABUSE.
Protecting Your Investment
Often detectorists are disappointed when their new detector slowly becomes less and less
responsive and seems to have lost some of its original peak performance. You can help avoid this
from happening to your detector by following these basic care and protection guidelines:
•Operate your detector exactly as recommended in this Operator Instruction Manual.
•Use only high-quality alkaline batteries of the correct voltage. Never substitute a different
voltage. When using a Ni-Cad battery, always use a separate convertible pack with the
proper voltage output for the detector’s design.
•Remove the battery from the detector after each use. This will prevent damage to the
detector if the battery leaks.
•The searchcoil cable is hard-wired to the searchcoil and protected by a strain relief.
Inspect the strain relief frequently to make sure it is firmly attached and intact.
•Keep cables properly wound around the pole stems and protect them during use. Floppy,
pinched, or cables that become snagged during use may short, causing erratic noises or
unnecessary replacement of the searchcoil.

•Sweep the searchcoil carefully, especially when using around rocks and building
foundations. Avoid hitting the searchcoil against hard, solid objects and surfaces.
•Keep your searchcoil slightly off of the ground during the sweep, especially when using
in gravel or hard, rocky dirt.
•Always use a properly designed protective scuff cover on the searchcoil. (See "Optional
Accessories" in the next section.)
•Remove and clean out scuff covers periodically to avoid buildup of mineralized dirt
particles which will affect performance.
•The searchcoil is waterproof and can be submerged in either fresh or salt water. After the
searchcoil is used in salt water, rinse it and the lower stem assembly well with fresh water
to prevent corrosion of the metal parts.
•The searchcoil is waterproof but the electronics are not, so always prevent any moisture
or water from entering the control housing and never allow the cable connectors to
become submerged in water.
•If working in or near water, or if there is a possibility of rain, use a protective weather
resistant pouch or plastic bag to cover the control housing. Make sure it can "breathe" in
order to ensure against condensation buildup inside.
•After each use, clean the detector with a soft cloth to remove dust, moisture, or other
contaminants.
•When transporting the detector in a car during hot weather, store it on the floor of the
passenger compartment if possible. Using a carry bag gives additional protection. In any
case, never allow the detector to roll around unprotected in the trunk or back of a pickup
truck.
•Protect your detector from dust, moisture, and extreme temperatures during storage.
•When shipping, use the original factory carton or similar heavy-duty container and
provide a minimum one inch of padding around all parts.
•Treat your detector as you would any sensitive electronic instrument. Though ruggedly
constructed and designed to withstand the demands of normal treasure hunting, proper
care is essential.
OPTIONAL ACCESSORIES
Tesoro metal detectors and genuine Tesoro accessories are sold only through independent Tesoro
Authorized Dealers, who are almost always metal detectorists themselves. They can answer your
questions about your Tesoro detector, what accessories may be helpful and about metal detecting
in general.
See your Tesoro Authorized Dealer for more information and prices on optional accessories.
Searchcoils
The 9 x 8 monolithic searchcoil provided with the Vaquero is designed for best all-around
performance. Optional searchcoils may add to your detector's performance.

Smaller searchcoils give better “target separation”—that is, more distinct target response for
metal objects buried closely together—which is very useful when hunting trashy sites. Very
small searchcoils can deliver the best response and depth to small targets such as fine gold chains
with some sacrifice in depth on larger objects. Larger searchcoils give a wider sweep, covering
more ground, and provide greater depth especially on larger objects; however, they may not
detect some very small objects such as half dimes and will have difficulty in very trashy areas.
Wide scan searchcoils ignore ground mineralization better than concentric searchcoils and may
offer improved performance in extreme ground conditions.
Selecting the right optional searchcoil depends on factors such as what you are searching for and
search site conditions. No one searchcoil is better than all the rest. Several optional
interchangeable searchcoils are available for the Vaquero. They are all easy to mount and require
no special tools. See the next page for a list of these searchcoils with the Tesoro part # and
description.
Tesoro Searchcoils
Tesoro Part #
Description
COIL-575RC-SC-G
5.75” round concentric
COIL-7EC-G
7” elliptical concentric
COIL-8RC-G
8” round concentric
COIL-8.5RW-G
8.5” round widescan
COIL-10EW-G
10” elliptical widescan
COIL-11RW-G
11” round widescan
COIL-12x10W-LC-G
12x10” widescan
Optional scuff covers are also available for any Tesoro searchcoil.
Headphones
Most metal detectorists prefer to use headphones instead of the detector's built-in speaker.
Headphones help block out background noise (such as wind) and make it easier to hear faint
signals. Headphones with a builtin volume control will allow you to adjust the sound volume to
your preference.
SPECIFICATIONS
Operating Frequency
14.3 kHz, 14.5 kHz, 14.7 kHz
Searchcoil Type
Monolithic (Carbon Fiber)
Searchcoil Size
9 x 8

Cable Length
Approx. 3’
Audio Frequency
Approx. 293 Hz or VCO
Audio Output
1½” speaker and headphone jack
Headphone Compatibility
¼” stereo plug
Weight (may vary slightly)
2.2 lbs.
Battery Requirement
One 9 volt DC (alkaline)
Battery Life (typical)
10 to 20 hours
Optimum Temperature Range
30° to 100° F
Optimum Humidity
0 to 75% R.H.
Operating Modes
Threshold-based All Metal
Silent Search Discriminate
Pinpoint Mode
All Metal Fast Auto-Tune
Metal Detectorist's Code of Ethics
1. Always check federal, state, county and local laws before searching. It is your
responsibility to "know the law."
2. Abide by all laws, ordinances or regulations that may govern your search and the area
you will be in.
3. Never trespass. Always obtain permission prior to entering private property, mineral
claims, or underwater salvage leases.
4. Do not damage, deface, destroy, or vandalize any property, including ghost towns and
deserted structures, and never tamper with any equipment at the site.
5. Never litter. Always pack out what you take in and remove all trash dug in your search.
6. Fill all holes, regardless how remote the location. Never dig in a way that will damage, be
damaging to, or kill any vegetation.
7. Do not build fires, camp at or park in non-designated or restricted areas.
8. Leave all gates and other accesses to land as found.
9. Never contaminate wells, creeks, or any other water supplies.
10. Be courteous, considerate, and thoughtful at all times.
11. Report the discovery of any items of historic significance to the local historical society or
proper authorities.
12. Uphold all finders, search and salvage agreements.
13. Promote responsible historical research and artifact recovery and the sharing of
knowledge with others.
WARRANTY SERVICE

Your Tesoro metal detector is covered by a Limited Lifetime Warranty, the terms of which are
listed below. If your metal detector should require service, you may return it to the Tesoro
factory at the address below.
LIMITED LIFETIME WARRANTY
This warranty gives you specific legal rights, and you may have other rights which vary from
state to state.
This instrument is warranted to be free of defects in material and workmanship as long as it is
owned by the original consumer purchaser. This warranty is not transferable and is valid only if
the warranty registration card has been completed and mailed within 10 days of purchase.
TESORO will, at its option, repair or replace any instrument covered by this warranty, without
charge, except for transportation charges, at its factory in Prescott, Arizona.
This warranty excludes batteries, damage caused by leaky batteries, cable breakage due to
flexing on body mount units, and wear of the searchcoil housing. Also excluded are instruments
which have been abused, altered, or repaired by an unauthorized party.