Harbor Freight Metal Detector 67378 Owner’s Manual:

The Harbor Freight Metal Detector 67378 Owner’s Manual provides essential information and safety instructions for the proper use and maintenance of the metal detector. This manual includes detailed instructions on assembly, operation, inspection, and cleaning procedures, as well as important safety warnings and precautions. Users are advised to read the entire manual carefully before using the product to avoid serious injury. The manual also contains specifications, components, and functions of the metal detector, including sensitivity adjuster, metal-type discriminator, all-metal indicator, tone adjuster, volume control, target locator, low battery indicator, auto ground balance, and mode selector. Additionally, the manual provides guidance on battery installation, leg adjustment, search coil angle adjustment, and headphone use. Users are encouraged to keep this manual and the receipt in a safe and dry place for future reference. In case of missing or broken parts, users can call the customer service number provided in the manual.

Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly, operating, inspection, maintenance, and cleaning procedures.
Write the product’s serial number in the back of the manual near the assembly diagram (or month and year of purchase if the product has no number).
Keep this manual and the receipt in a safe and dry place for future reference.

Metal Detector

Visit our website at: http://www.harborfreight.com
Email our technical support at: productsupport@harborfreight.com

When unpacking, make sure that the product is intact and undamaged. If any parts are missing or broken, please call 1-888-866-5797 as soon as possible.© Copyright
2021 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.
Diagrams within this manual may not be drawn proportionally. Due to continuing improvements, the actual product may differ slightly from the product described herein. Tools required for assembly and service may not be included.

WARNING

Read this material before using this product.
Failure to do so can result in serious injury.

SAVE THIS MANUAL.

**| WARNING SYMBOLS AND DEFINITIONS
** This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
---|---

DANGER

| Indicates a hazardous situation which, if not avoided, will result in death or serious injury.

WARNING

| Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

** CAUTION**

| Indicates a hazardous situation that, if not avoided, could result in minor or moderate injury.

NOTICE
CAUTION

| Addresses practices not related to personal injury.

General power tool Safety Warnings

**Warning read all safety warnings and instructions. Failure to follow the warnings and instructions may result in electric shock, fire, and/or serious injury.
Save all warnings and instructions for future reference.**
The term ″power tool″ in the warnings refers to your battery-operated (cordless) power tool.

1. Electrical safety
   Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.

2. Personal safety
   a. Stay alert, watch what you are doing, and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.
   b. Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.

3. P ower tool use and care
   a. Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.
   b. remove the batteries from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk
   of starting the power tool accidentally.
   c. Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.
   d. Maintain power tools. check for misalignment or binding of parts, breakage of parts, and any other condition that may affect the power tool’s operation. if damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools.

4. Service
   a. Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.

Metal Detector Safety Warnings

1. Maintain labels and nameplates on the tool. These carry important safety information. If unreadable or missing, contact Harbor Freight Tools for a replacement.

2. Handle Tool carefully at all times. Dropping Tool can cause damage to circuit boards and housing, which can cause the tool to malfunction or fail.

3. Do not mix old and new batteries. Do not mix alkaline, standard (carbon-zinc), or rechargeable (nickel-cadmium) batteries. Position batteries in proper polarity. Do not use swollen or leaking batteries.

4. Wear ANSI-approved safety goggles and heavy-duty work gloves when assembling and digging holes.

5. consult local regulations before using a detector, digging, or taking any findings. Obtain property owners’ permission before detecting their property.

6. Only use and store in normal temperature environments. Extremes in temperature can shorten the effectiveness of electronic devices and melt or damage plastic parts.

7. avoid electrical shock. Any metal detector may discover underground power lines, explosives, or other items which when struck could cause personal injury. Do not use this product in areas where there might be underground electric lines or pipes buried at shallow depths. Never search in military zones where bombs or other explosives
   may be buried. Avoid striking any line known or suspected to be carrying electric power. Do not search any pipeline, particularly if it could contain flammable gas or liquid. In areas of uncertain conditions, use reasonable caution before using the Tool. If there is any question about a condition being safe or unsafe, do not operate the Tool.

8. Keep the Metal Detector away from any lights, TVs, computers, and mobile telephones. These can all cause electromagnetic interference.

9. Only the Search coil and black section of the Lower Leg are waterproof. Do not immerse the unit beyond the black section of the Lower Leg.

10. Keep the tool clean. Wipe the housing after each use. The search coil is washable and can be fully submerged. Never submerge the control housing. Protect the control housing from rain, blowing surf, and heavy mist. Disassemble the Leg and wipe it clean after use in sandy areas.

11. Use the right tool for the job. There are certain applications for which this tool was designed. Do not modify this tool and do not use this tool for a purpose for which it was not intended.

12. This product is not a toy. Keep it out of reach of children.

13. People with pacemakers should consult their physician(s) before use. Electromagnetic fields in close proximity to the heart pacemakers could cause pacemaker interference or pacemaker failure. In addition, people with pacemakers should:
    • Avoid operating alone.
    • Properly maintain and inspect to avoid electrical shock.

14. The warnings, precautions, 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 that cannot be built into this product but must be supplied by the operator.

SAVE THESE INSTRUCTIONS

SPECIFICATIONS

Type Discriminator; All-Metal Indicator; Tone Adjuster;
Volume Control; Target Locator; Low Battery Indicator; Auto Ground Balance; Mode Selector

SETUP – BEFORE USE

**** Read the Entire IMPORTANT SAFETY INFORMATION section the beginning of this manual including all text under subheadings therein before set up or use of this product.

WARNING
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch of the tool off and remove the batteries before assembling or making any adjustments to the tool.

Note: For additional information regarding the parts listed in the following pages, refer to the Assembly Diagram near the end of this manual.

Components

Tool Set Up

WARNING
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch of the tool off and remove the batteries before adjusting the tool or installing accessories.

Note: When adjusting the length of the Metal Detector, be careful to keep the plastic Tapered Bushing in place with the smaller end toward the smaller end of the Lock Nut.

1. To attach the two legs, slide the Threaded Insert over the end of the Upper Leg, making sure that the tabs inside the Insert lock into the cut-outs at the end of the leg. Insert the tapered end of the Tapered Bushing into the Lock Nut and lightly thread the nut over the Threaded Insert. Slide the Lower Leg into the Lock Nut. To take the
   slack off the cord, rotate the Lower Leg, enabling the cord to wind around the two Legs. Rotate the Nut counterclockwise to lock the Legs.

2. To adjust the length of the Legs, turn the Lock Nut in a clockwise direction, slide the Lower Leg to the desired extension length and turn the Nut counterclockwise to secure the Legs together.

3. To adjust the angle of the Search Coil, loosen the Coil Pivot and Knob Bolt and tilt it. Position the Search Coil so that it is parallel to the ground when holding the unit by the Handle with your arm in the Arm Support.

4. If needed, re-adjust the length of the Metal Detector after adjusting the position of the Search Coil.

Batteries

1. Make sure the On/Off/Volume control is set to OFF. Slide the Battery Cover (26) off of the back of the Control Box.
2. Insert six AA batteries (sold separately), aligning polarities as indicated.
3. Replace the Battery Cover. note: Use only fresh batteries of the required size and type. Do not mix old and new batteries, different types (standard, alkaline, or rechargeable), or rechargeable batteries of different capacities.
   Always remove old or weak batteries. Batteries can leak chemicals that can destroy electric parts.
   If you do not plan to use the detector for a week or more, remove the batteries.
   Dispose of spent batteries according to your local, state, and federal regulations.
   Note: You can extend battery life by using earphones, which require less power than the built-in speaker.
   Note: Replace batteries when the LOW BATT light turns on in the View Meter.

Headphones

1. Insert headphone (sold separately) jack into Earphone socket.
2. To protect your hearing, set the On/Off/ Volume Control to OFF before using the earphones, then adjust the level to the lowest setting before you begin listening.
3. Do not listen to extremely high volume levels. Extended high-volume listening can lead to permanent hearing loss.
4. Do not wear headphones while operating your detector near high-traffic areas. Pay attention to traffic safety.

Functions and indicators

On/Off/Volum e – Turns on power to the unit and sets the sound level.
SENS – Sets the sensitivity level of the unit. Zero setting is the lowest level and 10 is the highest.
For general use, set the sensitivity to a higher position. In a mineralized area or area with electrical interference, a lower setting may be more effective.
MODE – Sets the unit to three modes:
DISC, ALL METAL, and TONE. target Button – It is used with ALL METAL mode to pinpoint a target object’s location.
DiSC/TONE – Adjustment knob for metal identification.
View Meter – Register’s signal strength when a metal is detected.
– DISC, ALL METAL, and TONE are motion modes. You have to move the Search Coil to find your target object.
– Target Mode is for pinpointing the location of the item when the item is below the surface.

Before Getting Started

Before beginning an outside search, you must test the unit with samples of metal. Use the following:

• an iron nail
• a five-cent coin (nickel)
• a one-cent penny (zinc coin, after 1982)
• a 25-cent silver quarter.

Place the Metal Detector on a wooden or plastic table with the Search Coil face up. Make sure the table is away from TVs, computers, or any device that can cause electromagnetic interference. See Figure C.

NOTE: Be sure to remove any watches, rings, or other metal objects on your fingers and hands.
Turn on the Metal Detector and set the VOLUME dial to the middle position. Set the MODE switch to the middle (ALL METAL). See Figure D.

Sweep the metal samples 2 to 3 inches or more above the center of the Search Coil. The Metal
Detector will respond to each with a “DI” tone and the pointer on the View Meter will swing to the right.
Note: Be sure to move the samples, as the Detector is in motion mode. Otherwise, the Detector will not respond.
Note: Adjusting the SEN’s dial from “0” to “10” will increase the Detector’s sensitivity.
Use the DISC/TONE dial to search for specific metals by having it not detect (“differentiate”) other kinds of metals.

For example, when the DISC/TONE dial is set to “0” the Detector will respond to ANY metal object with a “DI” tone and the meter will swing to the right.

1. To adjust the settings to PREVENT the unit from detecting iron metals, set the VOLUME and SENS dials at the midpoint.

2. Then set MODE switch to DISC and the DISC/ TONE dial to about “9 o’clock.” See Figure F.
   

3. As a test, sweep the iron nail sample 2 to 3 inches above the search coil. The unit will NOT respond (the meter pointer won’t swing and the unit is silent.) Sweeping the other samples should produce the “DI” tone and make the pointer move.

4. To have the unit differentiate nickel metals, set the DISC/TONE to about “11 o’clock.” See Figure G. Sweep the nickel in front of the Search Coil; the unit will not respond to the nickel or to the iron nail. But it will respond to the other samples.
   

5. To prevent the zinc penny from being detected, set the DISC/TONE dial to about “1 o’clock” See Figure H.
   By now, only the silver quarter should be detected.
   Note: The discrimination position of aluminum is similar to silver. So both metals will be detected at the same time. The discrimination position of gold is similar to the nickel setting.
   The Metal Detector can also be adjusted to detect all metals, yet signal a specific metal differently from the others.

6. Set the MODE switch to TONE and the VOLUME and SENS dials to their halfway points.

7. Set the DISC/TONE dial to about “9 o’clock” (the iron setting). Sweep the nail 2-3 inches above the Search Coil. The unit will make a short “KO” sound and the meter will swing to the right. Sweeping any of the other samples will produce the “DI” sound.

8. Rotate the DISC/TONE dial to mark the other specific metals with the “KO” sound. To use the Metal Detector to “target’ specific metals, set the MODE switch to ALL METAL and the VOLUME and SENS dials to the middle.

9. Press the red TARGET Button (6) on the panel. Set the silver quarter about five inches from the center of the Search Coil. The unit will make a continuous long tone and the meter will swing to the right. See Figure I.
   

10. Keeping the coin still, release the TARGET button. Wait two seconds, then press down the TARGET button again; the unit’s sensitivity will be reduced.

11. NOTE: Even though the coin’s location has not changed, when the unit’s sensitivity is reduced the Metal Detector will stop sounding a tone.

12. Repeat the above operation, bringing the coin closer to the Detector and making it sound a tone. Once operating an outside search, you can use the TARGET button to determine the location of the metal.

GENERAL OPERATING INSTRUCTIONS

1.  Once all the proper tests and adjustments have been made, the Metal Detector is ready to be used outdoors.

2. When first searching, set the Mode button to ALL METAL and SENS to the highest level.

3. Adjust the VOLUME to the desired level.
   Figure J

4. Sweep the Search Coil (19) slowly back and forth in an arc, keeping it about 1/2″ to 2″ from the ground. See Figure I.

5.  If you hear a beeping noise or see the needle jump to the right on the View Meter, you have located a metal object.

6. Use the TARGET button to pin-point the object. Then use the DISC or TONE modes to determine what kind of metal it is and whether you wish to dig out the item.

7. To prevent accidents, turn off the tool and remove the batteries after use. Clean, then store the tool indoors out of children’s reach.

Tips for Searching in Different Environments

1.  There are many factors that influence the sensitivity and accuracy of detecting objects, including the angle, depth, size, and oxidation of the target object. Various soil or seawater conditions, and also electromagnetic and electrical interference surrounding the target can also affect readings. Other metal detectors in the area will also cause
   interference, so when there is more than one unit in use, be sure they are at least 10 yards apart. Some ways to help increase success are:

2. If there is interference from similar metal detectors in your searching area, lower the SENS setting to stop the interference.

3. If there is interference from electrical cables, TV, radio, or other electrical devices in your searching area, lower the SENS setting.

4. When searching in highly mineralized areas, the unit may sound even if there is no metal. Lower the SENS setting, set the DISC to high, and increase the distance of the Search Coil from the ground until the false signal disappears. To set the DISC setting, place a test metal object in highly mineralized earth or wet sand and adjust the setting before beginning.

5. When searching in a trash area, set the DISC to the middle setting so that the unit can reject most in valuable metals such as nails, bottle caps, cans, and small pieces of iron.

6. Move all-metal digging tools when searching.

7. The SENS level is generally opposite the DISC setting. The higher the sensitivity level is, the worse the discrimination will be. You can lower the sensitivity to have better discrimination.

MAINTENANCE AND SERVICING

**** Procedures not specifically explained in this manual must be performed only by a qualified technician.

WARNING

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION : Turn the Power Switch of the tool off and remove the batteries from the tool before performing any inspection, maintenance, or cleaning procedures.
Do not use damaged equipment. Have the problem corrected before further use.

CLEANING AND MAINTENCE

1. BEFORE EACH USE , inspect the general condition of the tool. Check for loose hardware, misalignment or binding of parts, cracked or broken parts,
   damaged electrical wiring, and any other condition that may affect its safe operation.

2. Handle the Metal Detector gently and carefully. Dropping it can damage circuit boards and the case, and can cause the Detector to malfunction.

3. AFTER USE, wipe external surfaces of the tool with a damp clean cloth, then dry. Do not use harsh chemicals, cleaning solvents, or strong detergents to clean the detector.

PARTS LIST AND DIAGRAM

PLEASE READ THE FOLLOWING CAREFULLY

THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM IN THIS DOCUMENT AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT 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 REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.

Parts List

Part| Description|

Qty

---|---|---
1| Mode Switch| 1
2| Control Dials| 3
3| Console Cover| 1
4| Meter Cover| 1
5| Adhesive Sticker| 1
6| Target Button| 1
7| Switch| 1
8| Handle Section (Right)| 1
9| Nut| 1
10| Handle Section (Left)| 1
11| Headphone Socket| 1
12| Nut| 1
13| Arm Support| 1
14| Arm Support Pad| 1
15| Upper Leg| 1
16| Bolt| 1
17| Bolt| 1
18| Lower Leg| 1
19| Tapered Bushing| 1
---|---|---
20| Lock Nut| 1
21| Coil Pivot| 1
22| Knob Bolt| 1
23| Search Coil| 1
24| Threaded Insert| 1
25| Cable (not shown in diagram)| 1
26| Battery Cover| 1
27| Bolt| 2
28| Bolt| 2
29| Nut| 1
30| Housing| 1
31| Bolt| 1
32| PCB| 1
33| Sensitivity Potentiometer| 1
34| On/Off/Volume Potentiometer| 1
35| Tone Potentiometer| 1
36| View Meter| 1

PLEASE READ THE FOLLOWING CAREFULLY

THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM IN THIS DOCUMENT AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT 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 REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.

Record product’s Serial number Here:
Note: If the product has no serial number, record the month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts. Specify UPC 792363673785 when ordering parts.

Assembly Diagram

LIMITED 90 Day Warranty

Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards, and warrants to the original purchaser that this product is free from defects in materials and workmanship for the period of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper installation, normal wear, and tear, or lack of maintenance. We shall in no event be liable for death, injuries to persons or property, or for incidental, contingent, special or consequential damages arising from the use of our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.

To take advantage of this warranty, the product or part must be returned to us with transportation charges prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise. If our inspection verifies the defect, we will either repair or replace the product at our election or we may elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will return repaired products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning the product.

This warranty gives you specific legal rights and you may also have other rights which vary from state to state.

FAQS

What is included in the Harbor Freight Metal Detector 67378 Owner’s Manual?

The Harbor Freight Metal Detector 67378 Owner’s Manual includes essential information and safety instructions for the proper use and maintenance of the metal detector. It also contains specifications, components, and functions of the metal detector.

What are the safety warnings and precautions provided in the manual?

The manual provides important safety warnings and precautions for electrical safety, personal safety, power tool use and care, and metal detector safety.

What should I do if any parts are missing or broken?

If any parts are missing or broken, users can call the customer service number provided in the manual.

What are the functions of the metal detector?

The metal detector has a sensitivity adjuster, metal-type discriminator, all- metal indicator, tone adjuster, volume control, target locator, low battery indicator, auto ground balance, and mode selector.

What should I do before using the product?

Users are advised to read the entire manual carefully before using the product to avoid serious injury.

What should I do to prevent accidental operation?

Turn the Power Switch of the tool off and remove the batteries before assembling or making any adjustments to the tool.

Can I modify this tool or use it for a purpose for which it was not intended?

No, users should not modify this tool and should not use this tool for a purpose for which it was not intended.

Can I immerse the unit beyond the black section of the Lower Leg?

No, only the Search coil and black section of the Lower Leg are waterproof. Do not immerse the unit beyond the black section of the Lower Leg.

What should I do if I have a pacemaker?

People with pacemakers should consult their physician(s) before use and avoid operating alone. They should also properly maintain and inspect to avoid electrical shock.

What should I do if I have any questions or concerns that are not covered in the manual?

If there is any question about a condition being safe or unsafe, do not operate the Tool. The warnings, precautions, 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 that cannot be built into this product but must be supplied by the operator

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