Metal Detector
Model 43150
Assembly and Operating Instructions
3491 Mission Oaks Blvd., Camarillo, CA 93011
Copyright
2000 by Harbor Freight Tools®. All rights reserved.
No portion of this manual or any artwork contained herein may be reproduced in any shape
or form without the express written consent of Harbor Freight Tools.
For technical questions and replacement parts, please call 1-800-444-3353.
Revised Cover 09/04
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Safety Warnings and Precautions (continued)
8. Check for damaged parts. Before using any tool, any part that appears damaged should be carefully
checked to determine that it will operate properly and perform its intended function. Check for alignment and
binding of moving parts;any broken parts or mounting fixtures;and any other condition that may affect proper
operation.Any part that is damaged should be properly repaired or replaced by a qualified technician.Do not
use the tool if any switch does not turn On and Off properly.
9. Replacement parts and accessories. When servicing, use only identical replacement parts. Use of any
other parts will void the warranty. Only use accessories intended for use with this tool.Approved accessories
are available from Harbor FreightTools.
10. Do not operate tool if under the influence of alcohol or drugs. Read warning labels on prescriptions to
determine if your judgment or reflexes are impaired while taking drugs. If there is any doubt, do not operate the
tool.
11. Maintenance. For your safety, maintenance should be performed regularly by a qualified technician.
12. People with pacemakers should consult their physician(s) before using this product. Electromagnetic
fields in close proximity to a heart pacemaker could cause interference to or failure of the pacemaker.
Warning:The warnings, cautions, and instructions discussed in this instruction manual cannot cover all
possible conditions and situations that may occur. It must be understood by the operator that common
sense and caution are factors which cannot be built into this product, but must be supplied by the operator.
Unpacking
When unpacking, check to make sure all parts shown on the Parts Diagram and Parts
List are present. If any parts are missing or broken, please call Harbor Freight Tools at the
number on the cover of this manual.
Preparing to Operate
Adjusting the Stem
1. Turn locknut clockwise until it becomes loose (see Figure 1). Adjust the stem so when
you are standing upright with the detector in your hand, the search coil is level with and about
1/2 to 2 inches above the ground when your arm is relaxed at your side (see Figure 2).
Figure 1
Figure 2
Turn the stem’s lock nut counterclockwise to lock it in place.
Adjusting the Search Coil
Loosen the Knobs at the end of the Search Coil (the Search Coil
should be parallel with the ground). Tighten the Knobs enough
to keep the Search Coil from wobbling or rotating (see Figure 3).
Figure 3
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Rev 05/06
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Battery Installation
The Metal Detector requires the use of six AA bateries. Do not
mix old and new batteries and do not mix different types of
batteries.
1. If the Metal Detector is on, turn the volume on the control
housing to OFF (see Figure 4).
2. Press on the battery compartment cover and slide the cover
off in the direction of the arrow (see Figure 5).
Figure 4
3. Insert the batteries into the compartment as
indicated by the polarity symbols (+ and -) which
are marked inside the compartment (see Figure 6)
Replace the cover.
Remember to remove batteries if you do not plan on
using the Metal Detector for a week or more.
Figure 6
Figure 5
Testing Batteries:
Always test the battery power when the Metal Detector does not turn on, has weak
volume, will not tune properly, or has erratic operation.
Rotate VOLUME away from OFF and set OPERATE / BATT to BATT TEST
(see Figure 7).
If the pointer on the viewmeter is between 3 and 6 (green area),
the batteries have enough power to operate the detector. If the
pointer is not in the green area, replace the batteries.
Figure 7
Using Earphones:
Stereo earphones (not included) can be connected to the Metal
Detector. Using earphones saves battery power and makes it
easier to identify changes in the sound patterns. Earphones are
connected to the ear jack on the side of the Control Housing
(see Figure 8). When using earphones, protect your hearing by:
Figure 8
a. Set the volume to the lowest setting before you begin listening. Adjust the volume
to a comfortable level.
b. Never listen at extremely high volume levels; permanent hearing loss can result.
c. Once the volume is set, do not increase it. Over time, your ears adapt to the
volume level, so a volume level that does not cause discomfort might still damage
your hearing.
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Operation:
This metal detector distinguishes between ferrous and non-ferrous metals. Ferrous
metals contain iron. Non-ferrous metals do not (examples: gold, silver, copper, platimum,
aluminum, lead, and zinc).
When the Metal Detector senses a metallic object, the meter reading changes and the
detector might sound a tone. The reaction depends on what metal is detected.
Turning on and Tuning the Metal Detector:
While holding the detector in a comfortable position, rotate the
VOLUME away from OFF to the desired sound level. Set
OPERATE/BATT TEST to OPERATE to detect (see Figure 9).
Figure 9
TUNE fine tunes the balance between the detector’s receiver
and transmitter. This provides consistent pointer and tone
indications. To setTUNE: Rotate VOLUME to the 11 o’clock position.
Set DISCRIMINATION to its midpoint (see Figure 10).
Hold the search coil about 1 foot from the ground. Hold down
the red button on the handle, and slowly rotate TUNE left to
right until the pointer on the viewmeter rests at or near 0; then
release the red button.
Figure 10
As the search continues, you can fine-tune the detector
using DISCRIMINATION.
Note: To return the pointer to 0 at any time, simply press
down on the red button.
Figure 11
ToTest and Use the Metal Detector:
Before using the detector for the first time, you should test the unit to see how it reacts to
differnet metals. You can conduct this test outdoors or indoors.
For indoor test:
1. After removing watches, rings or any other metal jewelry, place the detector on a
wooden or plastic table (search coil’s angle so that the flat part faces upward) - see Figure
12. Note: never test on a floor inside a building, as it may have a type of metal present.
2. Rotate VOLUME to the 11 0’clock position.
3. Set DISCRIMINATION to its midpoint.
4. Take the sample of material to be tested (example: coin or gold
ring) and place it about 2 inches above the search coil. Note: the
Metal Detector will not detect without motion. You must move the
Figure 12
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object since you are not sweeping the Metal Detector.
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For IndoorTest (continued)
5. If the detector detects the material, it sounds a tone and the pointer moves to the left
(ferrous) or to the right (non-ferrous) while the detector determines the type of metal it is
detecting (see Figure 13).
6. If the detector does not detect the material, the battery power
may be low. Also verify that the search coil is properly connected.
The detector may also need to be fine tuned (see directions below
and on the next page.
Figure 13
OutdoorTesting and Use:
1. Locate an area outdoors where there is no metal present. Place a sample of the
material to be tested (coin or gold ring) on the ground.
2. Rotate VOLUME about two-thirds clockwise.
3. Press and release the red button on the handle. Slowly rotate TUNE until the pointer
is at or near 0. A tone should be barely heard.
4. With the search coil being held approximately 1 to 2
inches above the ground, slowly move the search coil over
the area where you placed the sample. Sweep in a side to
side motion as follows:
Sweep slowly to avoid missing targets. Never raise the sweep
coil while sweeping; sweep back and forth as if it was a
pendulum (see Figure 14).
Figure 14
If the detector successfully detects the material, it will sound a tone and the pointer will
move to the type of metal it found. If nothing was detected, try again (make sure the search
coil is being moved properly).
The detector will respond strongly when it detects most valuable metal oljects. If the
signal does not repeat after being swept over the target a few times, the target is probably
junk metal.
False signals can occur from electrical interference, large, irregular pieces of junk
metal, or finding trash on the ground. False signals usually occur broken or are non-repeat-
able.
After finding a metal item, wait a few seconds after the tone stops before continuing;
this allows the detector time to reset. You can also press the red button on the handle to
return the pointer to the center of the viewmeter.
FineTuning the Metal Detector:
Once you practice with the unit, you can fine tune it to make it more selective in what is
found. The ability to distinguish between different types of metal is termed discrimination.
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The DISCRIMINATION setting determines whether the detector will distinguish be-
tween different types of ferrous and non-ferrous metals.
You can set DISCRIMINATION to the minimum level (fully counterclockwise) or to the
maximum level (fully clockwise) or anywhere in between. As you set it to higher levels, the
detector first does not detect small pieces of silver paper, then thick foil, and finally metal
objects like pull tabs from soda cans (see Figure 15).
Note: As you move to a new area, you must adjust DISCRIMINATION.
As you sweep the search coil back and forth over the
ground surface you will recognize the difference between
signals that occur at random and signals that are stable
and repeatable. The key is to dig only for those targets
that produce a strong, repeatable signal. This will prevent
you from wasting time focusing on trash induced signals.
Figure 15
No metal detector is totally accurate. Many conditions influence the success of metal
detection. Among the factors that influence results are the angle at which the object rests in
the ground, the depth of object, the amount of iron the object contains and the size of the
object.
To accurately pinpoint a target: 1. Once the detector detects a target that is buried,
continue to sweep the search coil over the target in a narrowing side-to-side motion. 2.
Stop the search coil directly over the spot on the ground. Then move the search coil straight
forward away from you and straight back towards you. Make a mental note of the exact spot
on the surface where the detector beeps. Repeat these steps in an X pattern. The target
should be directly below the X at the area where the loudest response is heard.
Troubleshooting:
Problem
Suggestion for Cure
False signals are being displayed
Sweeping too fast or at the wrong angle.
Heavily oxidized metals are detected.
Pinpoint the target from several different
angles. If the detector does not display and
sound the same signal each time, the target
is probabley heavily oxidized metal.
Once a target is found, the display
does not show the correct metal type
May be more than one target in the area.
If target is heavily oxidized, an incorrect
reading may occur. This does not signify a
problem with the detector. It may be a type
of metal which is not recognizable to the
detector.
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PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDEDTHE PARTS DIAGRAM INTHIS MANUAL AS
A REFERENCETOOL ONLY. NEITHERTHE MANUFACTURER NOR DISTRIBUTOR MAKES ANY REPRESEN-
TATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY
REPAIRSTOTHE PRODUCT ORTHAT HE OR SHE IS QUALIFIEDTO REPLACE ANY PARTS OFTHE PROD-
UCT. IN FACT,THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATESTHAT ALL REPAIRS AND
PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS AND
NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER
REPAIRSTOTHE ORIGINAL PRODUCT OR REPLACEMENT PARTSTHERETO, OR ARISING OUT OF HIS OR
HER INSTALLATION OF REPLACEMENT PARTSTHERETO.
Note: Some parts are listed and shown for illustraion purposes only and are not available
individually as replacement parts.
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Parts Diagram
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