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Out of Level Indication
Out-of-level indicators alert you if the unit is
not on a level surface or if it is out of self-
leveling range:
• The LED flashes red once per second
• The laser beam stops rotating (if in rotation
mode) or dithering (if in dithering/dot mode)
and flashes a laser dot in sync with the LED
• The beeper sounds in sync with the laser
beam and
LED
Reposition the tool to ensure that it is within the
self-leveling range of ±6°. Once the unit is
within self-leveling range, it stops beeping, the
LED turns green, and the laser beam stops
flashing. The tool resumes the mode of the last
command issued.
Note: The out-of-level indicator overrides all
other indicators. If the laser tool is in low
battery or power standby mode and becomes
out of level, the out-of-level indicator overrides
the low battery or power standby mode
indicator.
Influences on Accuracy
T
he ambient temperature has the greatest
influence. Especially temperature differences
occurring from the ground upward can divert
the laser beam.
As thermal fluctuation is largest close to the
ground, the tool, if possible, should be
mounted on a commercially available tripod
and placed in the center of the working area.
Apart from exterior influences, device specific
influences (such as heavy impact or drop) can
The GRL145HV rotary laser tool has two
basic operating modes, the Rotation Mode
and the Dithering/Dot Mode.
Rotation Mode
The laser beam is dispersed throughout the
level or plumb plane. Rotation mode is used
under conditions where laser beam visibility
is poor or nonexistent (for example, outdoors
in daylight). It is not always possible to easily
see a rotating laser beam. A laser receiver-
detector makes it possible to detect and
correctly position the rotation mode indoors
or outdoors. The Rotation Mode is the default
mode when the tool is turned on.
When the laser is first turned on, it is rotating
at 120 rpms. Press the keypad rotation mode
button to cycle through the medium and fast
speeds, then back to slow speed. Decrease
speed to improve laser beam visibility,
especially for indoor applications.
Note: To enter rotation mode from
dithering/dot mode, press the keypad rotation
mode button.
Dithering/Dot Mode
The dithering line is a laser beam that moves
rapidly back and forth (dithers), producing a
shorter, beam that is brighter than beams in
the rotation mode. Because of the brighter
laser beam in the dithering mode, a laser
receiver-detector may not be required. The
dithering line length can easily be changed
according to application requirements in
either the level or plumb applications. The
dithering/dot mode is normally used for
indoor applications.
A choice of a laser dot or four dithering line
lengths are available. The laser beam is less
visible at the longer line length. In some
situations, it may be necessary to use a laser
receiver-detector to accurately locate
the beam.
When the laser is first turned on, it is rotating
at 120 rpms. To enter dithering/dot mode,
press the keypad dithering/dot button. A
laser dot appears. Continue pressing the
dithering/dot button to cycle through dot
mode and four different line lengths, and
then back from the longer line to the laser
dot. The laser dot or line dither can be
positioned through a
3
60° range in the level
or plumb plane by pressing one of the two
dot/line position control buttons.
In dot mode, a single press of either buttons
will move the dot in small increments in the
corresponding direction. Pressing and
holding either button moves the dot in
continuous slow motion for the first five
seconds, and pressing and holding beyond
five seconds moves the dot in faster speed.
Working Advice
• Always use the center of the laser point for
marking. The size of the laser point
changes with the distance.
Operating Modes- Rotation and Dot/Dithering
Leveling Accuracy
