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30 | English
In case of ground vibrations or position changes during operation, the measuring tool is
automatically levelled again. Upon levelling, check the position of the laser beams with
regard to the reference points to avoid errors arising from a change in the measuring
tool's position.
Working with the pendulum lock
For work with the pendulum lock, slide the on/off switch (2) to the " On" position. The
pendulum lock indicator (8) lights up red and the laser lines continuously flash slowly.
For work with the pendulum lock, automatic levelling is switched off. You can hold the
measuring tool freely in your hand or place it on a sloping surface. This means that the
laser beams are no longer levelled and no longer necessarily run perpendicular to one an-
other.
Accuracy Check of the Measuring Tool
Influences on Accuracy
The largest influence is exerted by the ambient temperature. In particular, temperature
differences that occur from the ground upwards can refract the laser beam.
In order to minimise thermal influences resulting from heat rising from the floor, it is re-
commended that you use the measuring tool on a tripod. In addition, position the meas-
uring tool in the centre of the work surface, wherever this is possible.
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 the holder or a tripod, or place it on a firm,
level surface. Switch on the measuring tool with the automatic levelling function en-
abled and select cross-line mode.
1 609 92A 7LU | (29.04.2022)
Bosch Power Tools
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