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Accuracy Check of the
Measuring Tool
Influences on Accuracy
The largest influence is exerted by the ambient
temperature. In particular, temperature differ-
ences that occur from the ground upwards can
refract the laser beam.
In order to minimize thermal influences result-
ing from heat rising from the floor, it is recom-
mended that you use the measuring tool on a
tripod. In addition, position the measuring tool
in the center of the work surface, wherever this
is possible.
In addition to external influences, device-spe-
cific influences (e.g. falls or heavy impacts) can
also lead to deviations. For this reason, check
the levelling accuracy each time before begin-
ning work.
First check the height accuracy and levelling ac-
curacy of the horizontal laser line, then the level-
ling accuracy of the vertical laser line.
Should the measuring tool exceed the maximum
deviation during one of the tests, please have it
repaired by a Bosch after-sales service.
Checking the Height Accuracy of the
Horizontal Line
For this check, you will need a free measuring
distance of 16ft (5 m) on firm ground between
two walls (designated A and B).
— Mount the measuring tool close to wall A on a
tripod, or place it on a firm, flat surface. Turn
the measuring tool on the magnetic rotating
mount 4 so that the laser outlet aperture 2 is
not obstructed. Switch on the measuring tool.
— Aim the laser at the closer wall A and allow
the measuring tool to level in. Mark the mid-
dle of the point at which the laser lines cross
on the wall (point I).
A
160992A8JG GLL50-20 G 202306.indd 13
Operation
B
5 m
— Turn the measuring tool 180°, allow it to level
in and mark the point where the laser lines
cross on the opposite wall B (point II).
A
180°
— Position the measuring tool – without rotating
it – close to wall B, switch it on and allow it
to level in.
— Align the height of the measuring tool (using
the tripod or by placing objects underneath
as required) so that the point where the laser
lines cross exactly hits the previously marked
point II on wall B.
A
— Turn the measuring tool 180° without adjust-
ing the height. Aim it at wall A such that the
vertical laser line runs through the already
marked point I. Allow the measuring tool to
level in and mark the point where the laser
lines cross on wall A (point III).
A
d
— The discrepancy d between the two marked
points I and III on wall A reveals the actual
height deviation of the measuring tool.
B
B
B
180°
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6/9/23 9:46 AM
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