Harbor Freight Tools 66632 - Manual (Page 3)

Page 3 For technical questions, please call 1‑800‑444‑3353. SKU 66632
Operating Instructions
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.
1. Cut a 3/4″ length of reflective tape
(included), peel off the backing
and attach the reflective tape to
the object to be measured.
Note: The longer the piece of reflective
tape, the easier it is to make the
measurement. However, the tape must
not wrap all the way around the object.
2. Point the Tachometer at the reflective
tape on the object, holding the tool
approximately 2″ to 8″ away.
3. Start the object turning.
4. Press and hold the Test Button,
keeping the tachometer perpendicular
to the reflective tape surface.
Spinning
Shaft
Reflective Tape
Figure B: Taking Measurement
5. After several seconds, a reading
will appear on the Display.
When the reading is stable, or almost
stable, note the reading on the Display
and then release the Test Button.
Note: If the reading fails to appear,
adjust the Tachometer’s angle so that it is
perpendicular to the reflective tape on the
object and/or adjust the distance between
the Tachometer and the reflective tape.
RPM MAX MIN PHOTO
Figure C: Display
Table A: Symbol Key
Low Battery Indicator;
batteries are low and need replacing
MAX Maximum reading is displayed
MIN Minimum reading is displayed
PHOTO Photo‑electricity mode symbol
RPM Revolutions per minute (RPM)
After the test button is released,
the maximum, minimum and last
measurements are stored.
To access previous measurements,
press and release the Memory
Button repeatedly to cycle through
the measurements. The indicators
above the digits will appear
as described in Figure C.