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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: When the laser beam is switched off,
the alert is indicated only by the flashing LED
and the audio signal.
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
The 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
lead to deviations. Therefore, check the
accuracy of the tool each time before starting
your work.
Should the tool exceed the maximum
deviation during one of the tests, see
recalibration procedure or have it recalibrated
by a Bosch after-sales service center.
All manuals and user guides at all-guides.com
Leveling Accuracy
Leveling
In the level position, the tool automatically
self-levels within ±6°. When the tool is turned
on. Once the tool is level, the LED turns to a
steady green, and the beeping stops. Press
button 27 (Horizontal laser beam) or button
33 (Vertical laser beam) the laser then begins
rotating at a slow speed.
Calibration
Although the GRL 160DHV laser tools are
calibrated to specification before leaving the
factory, they contain many precision-machined
parts that may be affected if subject to abuse.
Therefore, if a unit is dropped or sustains
significant impact, check its calibration. It is
also recommended that the tool be
periodically calibrated, as a normal
maintenance procedure.
To Calibrate the GRL160DHV:
1. Select a site for calibration that allows the
2. Set the unit on a level surface at one end
3. Turn on the unit with its power switch 1,
-13-
unit to be placed about 50 ft. (15m) away
from a smooth vertical surface, such as a
wall. Use an Allen wrench to remove the
calibration port covers on the side and
front of the unit. Store the calibration port
covers in a safe place.
of the range. Place the unit with the side
facing the wall. Ensure the calibration
port faces away from the wall.
then press the keypad laser level
(horizontal) on/off button 26. Select Line
Dither/Scan mode (at the shortest line
length) for best laser beam visibility. If the
beam is not visible, use the laser detector
to locate the beam.
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