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Checking the Horizontal Leveling
Accuracy of the Lateral Axis
A free measuring distance of 78 ft on a firm
surface in front of a wall is required for
the check.
– Mount the measuring tool onto the multi-
purpose attachment or a tripod, or place it
on a firm and level surface at a distance of
78 ft to the wall. Switchthe measuring
tool on.
7 8
– Direct one of the two lateral laser beams,
that run alongside the lateral axis of the
measuring tool, at the wall. Allow the
measuring tool to level in. Mark the centre
of the laser beam on the wall (point I).
d
– Rotate the measuring tool by approx. 180°
without changing its height. Allow it to level
in and mark the centre point of the other
lateral laser beam on the wall (point II).
Take care that point II is as vertical as
possible above or below point I.
– The difference d of both marked points I
and II on the wall results in the actual
height deviation of the measuring tool
alongside the lateral axis.
On the measuring distance of 2 x 78 ft = 156
ft, the maximum allowable deviation is:
156 ft x ±0.0036 in/ft = ±9/16 in (.563).
f t
180˚
Thus, the difference d between points I and II
may not exceed 9/16 in (max.).
Checking the Horizontal Leveling
Accuracy of the Longitudinal Axis
A free measuring distance of approximately
78 ft on a firm surface between two walls A
and B is required for the check.
– Mount the tool onto the multi-purpose
attachment or a tripod, or place it on a firm
and level surface close to wall A. Switch the
tool on.
A
– Direct the horizontal laser beam against
the close wall A and allow the measuring
tool to level in. Mark the center of the laser
beam on the wall (point I).
A
180˚
– Turn the tool around by 180°, allow it to
level in and mark the center point of the
laser beam on the opposite wall
B (point II).
– Without turning the tool, position it close to
wall B. Switch the tool on and allow it to
level in.
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78 ft
B
B
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