Bosch GLL 2 Professional - Vertical Line Accuracy Checks; Checking Vertical Line Levelling Accuracy

16 | English
1 609 92A 21X | (30.8.16) Bosch Power Tools
– Set up the measuring tool 5 metres away turned by 180° and allow it to
level in.
– Align the height of the measuring tool (using a tripod or by underlaying,
if required) in such a manner that the centre of the laser line is pro-
jected exactly against the previously marked point II on wall B.
– Mark the centre of the laser line as point III (vertically above or below
point I) on the wall A.
– The difference d of both marked points I and III on wall A indicates the
actual deviation of the measuring tool from the level plane.
On the measuring distance of 2x5m=10m, the maximum allowable
deviation is:
10mx±0.5mm/m=±5mm.
Thus, the difference d between points I and III must not exceed 5 mm
(max.).
Checking the Levelling Accuracy of the Vertical Line
For this check, a door opening is required with at least 2.5 m of space (on
a firm surface) to each side of the door.
– Position the measuring tool on a firm, level surface (not on a tripod)
2.5 m away from the door opening. Allow the measuring tool to level in
while in cross-line operation mode with automatic levelling, and direct
the frontal vertical laser line against the door opening.
2,5 m
2,5 m
2,5 m
2,5 m
2,5 m
2,5 m
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