Bosch GLL Professional 12-22 Original Instructions Manual page 18

18 | English
A
A
B
– Align the height of the measuring tool (using the tripod or by placing objects under-
neath as required) so that the centre of the laser line exactly hits the previously
marked point Ⅱ on wall B.
– Mark the centre of the laser line on wall A as point Ⅲ (vertically above or below
point Ⅰ).
– The discrepancy d between the two marked points Ⅰ and Ⅲ on wall A reveals the ac-
tual horizontal deviation of the measuring tool.
The maximum permitted deviation over the measuring distance of 2 × 5 m = 10 m is as
follows:
GLL 12‑22: 10 m × ±0.8 mm/m = ±8 mm. The discrepancy d between points Ⅰ and Ⅲ
must therefore amount to no more than 8 mm.
GLL 12‑22 G: 10 m × ±0.6 mm/m = ±6 mm. The discrepancy d between points Ⅰ and Ⅲ
must therefore amount to no more than 6 mm.
Checking the Level Accuracy of the Vertical Line
For this check, you will need a door opening (on solid ground) which has at least 2.5 m of
space either side of the door.
1 609 92A 8C4 | (05.07.2023)
– At a distance of 2.5 m from the measur-
ing tool, mark the centre of the laser line
on both walls (point Ⅰ on wall A and
point Ⅱ on wall B).
B
– Set up the measuring tool at a 5 m dis-
tance and rotated by 180° and allow it to
level in.
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