Bosch Professional GLL 12-22 Manual Original página 16

16 | English
In addition to external influences, device-specific influences (e.g. falls or heavy impacts)
can also lead to deviations. For this reason, check the levelling accuracy each time be-
fore beginning work.
First check the height accuracy and levelling accuracy of the horizontal laser line, then
the levelling 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 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 (3) so that the laser outlet
aperture (1) is not obstructed. Switch on the measuring tool .
A
5 m
A
180°
– Position the measuring tool – without rotating it – close to wall B, switch it on and al-
low it to level in.
1 609 92A 8C4 | (05.07.2023)
– Aim the laser at the closer wall A and al-
low the measuring tool to level in. Mark
B
the middle of the point at which the laser
lines cross on the wall (point I).
– Turn the measuring tool 180°, allow it to
level in and mark the point where the
B
laser lines cross on the opposite wall B
(point Ⅱ).
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