Digital Contact Tachometer
Item 66400
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
When unpacking, make sure that the product is intact and undamaged.
If any parts are missing or broken, please call 1-800-444-3353 as soon as possible.
Visit our website at: http://www.harborfreight.com
Copyright© 2008 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.
Specications
Display LCD 5 Digits
RPM Range 2.5 - 19,999 RPM
Accuracy ± 0.05 plus 1 RPM
Power Source
4x ‘AA’ Batteries
(Not Supplied)
Operating
Environment
32° - 104° F; 0 - 50° C
< 85% Humidity
IMPORTANT SAFETY
INFORMATION
1. When in use, this tool is in contact with rotating parts.
2. Do not touch rotating parts. Do not wear
loose clothing when working with rotating
parts. Contain hair, jewelry and any item that
may become entangled in rotating part.
Email tech support at: tech@harborfreight.com
Manual Revised 11f
Page 2 For technical questions, please call 1-800-444-3353. SKU 66400
3. This product is not a toy. Do not allow
children to play with or near this item.
4. Position batteries in proper polarity and
do not install batteries of different types,
charge levels, or capacities together.
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.
Important Components and Controls
Axle
Function Switch
MEMORY Button
TEST Button
Display
Axle: Install the selected Adapter on this Axle.
TEST Button: Use to perform Tests.
LCD Display: Information is displayed on this screen.
MEMORY Button: Use to recall last reading, minimum
reading and maximum reading of last test.
Function Switch: Use to select desired measurement:
a. FT/MIN Surface speed in Feet per Minute
b. M/MIN Surface Speed in Meters per Minute
c. CONTACT Rotation speed in RPM
Display
CONTACT RPM
MAX MIN
ft/min m/min
Symbol Meanings:
Battery Symbol: Batteries need to be replaced.
Operating with discharged batteries
may cause erratic results.
MAX: Maximum reading is displayed.
MIN: Minimum reading is displayed.
CONTACT: Unit is ready to start test.
ft/min: Surface speed in Feet per minute.
m/min: Surface speed in Meters per minute.
RPM: Rotational speed in revolutions per minute.
Page 3For technical questions, please call 1-800-444-3353.SKU 66400
Set Up
Read the ENTIRE IMPORTANT SAFETY
INFORMATION section at the beginning of
this document including all text under
subheadings therein before set up or use
of this product.
Battery Installation
1.
Battery Compartment
Before use, install four ‘AA’ batteries (not supplied).
2. To install batteries, remove Bolt (18)
from Battery Cover (17).
3. Remove Battery Cover (17) from Back Cover (12).
4. Install four ‘AA’ batteries in battery compartment.
Match battery polarity to battery case markings.
5. Replace Battery Cover (17).
Reinstall Bolt (18). Do not overtighten.
6. Whenever the Low Battery Indicator
appears, replace the batteries.
7. Do not short the battery terminals
together when replacing batteries.
8. Do not dispose of old batteries in re. Always
dispose of batteries in accordance with
guidelines provided by local authority.
Note: This tool may be powered using an AC adaptor
instead. Plug adapter (not included) into
adapter Socket and into a 120 V~ outlet.
Installing Adapters
1.
Installing Adapter
Before use, the correct Adapter must be installed.
- Cone RPM Adapter (24, 25)
- Funnel RPM Adapter (23)
- Linear Speed Adapter (19, 20)
2. The Adapters are held in place by the Spring Ball
Bearing (26). Slide the Adapter on or off as needed.
Operation
RPM Measurement
1. Attach the Cone or Funnel Adapter to
the Axle (27) as described above.
2. Set Function Switch to CONTACT.
3. Press the tip of the cone to the center of the rotating
shaft to read shaft RPM. Keep the Tachometer’s
Axle in line with the center of the shaft at all times.
4. Press and hold the TEST button.
5. When the cone gains steady rotational speed,
read the RPM on the LCD screen.
Linear Speed Measurement
1. Attach the Linear Speed Adapter Wheel (20)
to the Axle (27) as described above.
2. Set the Function Switch to FT/MIN (Feet per
minute) or M/MIN (Meter per minute).
3. With the Axle parallel to the rotating shaft, touch the
side of the shaft with the side of Adapter Wheel (20).
Maintain light and steady pressure against the shaft.
4. Press and hold the TEST button.
5. When the cone gains steady rotational speed,
read the RPM on the LCD screen.
REV 09c
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