Pittsburgh 58231 Assembly instructions

58231
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Email our technical support at: [email protected]
12" Digital Caliper
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 product has no number).
Keep this manual and the receipt in a safe and dry place for future reference. 23e
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©2022 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, actual product may differ slightly from the product
described herein. Tools required for assembly and service may not be included.
Read this material before using this
product. Failure to do so can result in
serious injury. SAVE THIS MANUAL.

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Specifications
Display Units Inches & Millimeters
Accuracy ±0.001" (0.03mm)
Display 0.0005" (0.01mm)
Power Supply 1.5V LR44 (Included)
Important Safety Information
1. CONTAINS BUTTON BATTERY.
Keep out of your child’s reach.
Discard button batteries carefully.
Do not allow children to play with
devices that contain button batteries.
This product is not a toy.
2. Wear ANSI-approved
safety goggles during use.
3. Keep work area clean and well lit.
4. Do not operate when tired or
when under the influence of
alcohol, drugs or medication.
5. Use as intended only.
6. Inspect before every use; do not use
if parts are loose or damaged.
7. Maintain product labels and nameplates.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
Components and Controls
Prongs
OFF/ON
Button
ZERO
Button
Lock Screw
in/mm Button
Battery
Cover
Thumb
Knob

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Instructions
1. Push the OFF ON button to turn caliper on.
2. To toggle measurement between inches
and millimeters, press in/mm button.
3. With jaws closed, press ZERO
to set readout to 0.
4. To measure outside of object,
set the bottom prongs outside
object being measured. Slide the jaws
together until they gently contact the item.
5. To measure inside of object, set the
top prongs inside object being measured.
Spread prongs apart until they
touch surface of object.
6. Press OFF ON button to turn
Caliper off. Caliper also has an
automatic OFF function.
7. Incorrect function of Caliper may indicate
low battery. Follow Battery Removal and
Replacement instructions on page 4.
Note: Replacement parts are not available.
Outside Measurement Inside Measurement
Depth Measurement Step Measurement

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Maintenance and Servicing
Procedures not specifically explained in this manual
must be performed only by a qualified technician.
Cleaning and Maintenance
1. Keep body face clean. Prevent
liquid from getting into slider.
2. Face should be cleaned with a
clean, dry, lint-free cloth.
Note: Do not clean with acetone or alcohol.
3. Lubricate body with a few drops of clock oil.
4. Keep battery compartment clean
and free of corrosion.
Battery Removal and Replacement
1. Open battery compartment
to right of display.
2. Remove battery.
3. Install new SR44 battery positive (flat) side
up, and slide Battery Cover back into place.
4. Keep batteries out of reach of children.
Keep batteries in original package until
ready to use. Discard used batteries
immediately. Do not allow children to
play with devices containing batteries.

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Troubleshooting
Problem Possible Causes Possible Solutions
Every second
5 digits jump
simultaneously.
Low Battery. Replace Battery.
Display cannot
count.
Faulty Circuit. Remove Battery, wait 30 seconds,
and replace Battery.
Display shows
000.00 or
IN 00.000
Function button
springs misaligned.
Have qualified technician service Caliper.
Reading error
for full length
is ≥ 0.1 mm
Sensor may be
obstructed.
Have qualified technician service Caliper.
No display on
LCD screen.
1. Poor battery contact.
2. Low Battery.
1. Remove Battery from Compartment.
Clean Battery Compartment
and replace Battery.
2. Replace Battery.
Follow all safety precautions whenever diagnosing or servicing the tool.
Remove battery before service.

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Parts List and Diagram
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR
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 Beam 1
2 Slide 1
3 LCD Display 1
4 Depth Measure 1
5 Down Baffle 1
6 Screw 2
7 Top Baffle 1
8 Back Label 1
9 Underlay 2
10 Sensor Plant 1
11 Scale 1
12 Reed 1
13 Screw 1
14 Pin 2
15 Roller Wheel 1
16 Screw 5
Record Product’s Serial Number Here: __________________________________________
Note: If product has no serial number, record 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 193175498052 when ordering parts.

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Assembly Diagram
Assembly Diagram

Limited Lifetime Warranty
Harbor Freight Tools warrants to the original purchaser that this Pittsburgh product
shall be free from defects in materials and workmanship for its useful life.
If your Pittsburgh product does not perform in accordance with this warranty,
Harbor Freight Tools will, at its option and expense, repair or replace (or elect to refund the
purchase price if we cannot repair or replace), your Pittsburgh product, which shall be your
sole and exclusive remedy. To obtain warranty service, Pittsburgh products must be returned
with proof of purchase to a Harbor Freight Tools retail store or returned by mail after contacting
Harbor Freight Tools Product Support at 1-888-866-5797 and receiving a return authorization.
This warranty excludes normal wear and tear and does not apply to products subjected
to misuse, use or operation other than for the intended purpose or not in accordance
with the product manual, abuse, accident, modification or alteration, unauthorized
repair, improper storage, neglect, or lack of maintenance. This warranty is in lieu of
all other warranties. Harbor Freight Tools is not liable for incidental, indirect, special,
consequential, or punitive damages or costs arising from the use of this product. Some
states do not allow the exclusion or limitation of incidental or consequential damages,
so the above limitation may not apply to you. This warranty gives you specific
legal rights, and you may also have other rights which vary from state to state.
Pittsburgh is a trademark of Harbor Freight Tools. All other brands and
trade names are the property of their respective owners.
26677 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797