Practical Advice - Bosch GPL 3 Professional Manual Original

12 | English
points Ⅰ and Ⅲ must therefore amount to no more than
12 mm.
Checking Plumb Accuracy
For this check, you will need a clear measuring space on firm
ground with a distance of approx. 5 m between the floor and
the ceiling.
– Mount the measuring tool to the holder or a tripod. Switch
the measuring tool on and rotate it in such a manner that
the bottom plumb beam can be seen on the floor. Allow
the measuring tool to level in.
– Mark the centre of the top laser point on the ceiling
(point I). Also mark the centre of the bottom laser point
on the floor (point II).
d
180°
– Turn the measuring tool by 180°. Position it so that the
centre of the bottom laser point falls onto the marked
point II. Allow the measuring tool to level in. Mark the
centre of the top laser point (point III).
– The discrepancy d between the two marked points Ⅰ and
Ⅲ on the ceiling reveals the actual deviation of the meas-
uring tool from the vertical plane.
You can calculate the maximum permitted deviation as fol-
lows:
Doubled distance between floor and ceiling × 0.3 mm/m
Example: At a floor-to-ceiling distance of 5 m, the maximum
deviation amounts to
2 × 5 m × ±0.3 mm/m = ±3 mm. The points Ⅰ and Ⅲ must
therefore be no further than 3 mm from each other.

Practical Advice

Always use the centre of the laser point for marking.
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The size of the laser point changes with the distance.
1 609 92A 4HS | (28.01.2019)
Working with the measuring plate (accessory)
The measuring plate (15) can be used to project the laser
mark onto the ground and/or the laser height onto a wall.
The offset to the desired height can be measured using the
zero field and the scale, and can be projected at another
point. This means that you do not need to precisely adjust
the measuring tool for the height you want to project.
The measuring plate (15) has a reflective coating that en-
hances the visibility of the laser beam at greater distances
and in intense sunlight. The brightness intensification can
only be seen if you view the measuring plate with your line of
sight parallel to the laser beam.
Working with the Tripod (Accessory)
A tripod offers a stable, height-adjustable support surface
for measuring. Place the measuring tool with the 1/4" tripod
mount (6) on the thread of the tripod (16) or a conventional
5 m
camera tripod. Tighten the measuring tool using the locking
screw of the tripod.
Roughly align the tripod before switching on the measuring
tool.
Attaching using the holder
To attach the measuring tool to the holder (8), tighten the
locking screw (9) of the holder in the 1/4" tripod mount (6)
so that it is fixed to the measuring tool. Roughly align the
holder before switching on the measuring tool.
To turn the measuring tool on the holder (8), loosen the
locking screw (9) slightly.
– Rotate the measuring tool on the holder (8) sideways or
towards the rear to make the bottom plumb beam visible.
– Rotate the measuring tool on the holder (8) to project
heights with the horizontal laser beam.
With the holder (8), the measuring tool can be attached as
follows:
– Mount the holder (8) to the tripod (16) or a commercially
available camera tripod via the 1/4" tripod mount (14).
Use the 5/8" tripod mount (13) to secure the measuring
tool on a commercially available building tripod.
– The holder (8) can be attached to steel parts using the
magnets (11).
– The holder (8) can be attached to dry construction walls
or wooden walls using screws. To do this, insert screws of
a length of at least 60 mm through the screw holes (10)
of the holder.
– The holder (8) can also be fastened to pipes or similar
beams using a commercially available strap by threading
it through the opening for the strap attachment (12).
Laser Viewing Glasses (Accessory)
The laser viewing glasses filter out ambient light. This makes
the light of the laser appear brighter to the eye.
Do not use the laser goggles as protective goggles.
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The laser goggles make the laser beam easier to see; they
do not protect you against laser radiation.
Do not use the laser goggles as sunglasses or while
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driving. The laser goggles do not provide full UV protec-
tion and impair your ability to see colours.
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