Bosch GTL 3 Professional Original Instructions Manual page 23

– Position the measuring tool (without turn-
ing it) at a distance of 5 m so that the
crossing point of the laser lines is on the
already marked point II and that the 0°
laser line runs through the point III.
Mark the centre of the 90° laser line at a
distance of 5 m (Point IV).
– Turn the measuring tool by 90° so that
the centre of the 0° laser line runs
through the point IV.
The crossing point of the laser lines must
still be on the point II.
– Mark the centre of the 90° laser line at a
distance of 5 m as point V as near as pos-
sible next to the point I.
– The difference d of the two points V and I
is the actual deviation of the 0° laser line
and the 90° laser line from the right angle.
Bosch Power Tools
The measuring length 2 x 5 m = 10 m has a
maximum admissible deviation of:
10 m x ±0.2 mm/m = ±2 mm.
Therefore, the maximum difference d be-
tween the points I and V may be 2 mm or less.
Checking the angular accuracy between
the 0° and the 45° laser lines
– Position the measuring tool in one of the
corners of the measuring surface. Switch
on the measuring tool and align it so that
the 0° laser line runs along the long side
of the measuring surface and that the 90°
laser line runs along the short side of the
measuring surface.
– Mark the crossing point of the laser lines
on the floor (Point I). Mark also the centre
of the 0° laser line at a distance of 5 m
(Point II) and at a distance of 10 m
(Point III).
English | 23
10 m
1 609 929 S09 | (15.10.08)