Checking the Leveling Accuracy of the Horizontal
Line
For the check, a free surface of approx.
26 x 26 ft is required.
– Set up the tool on a firm, level surface
between both walls A and B onto the
magnetic bracket or a tripod. Allow the tool
to level in.
A
– At a distance of 13 ft from the tool, mark the
c e n t e r
o f
( p o i n t
I
o n
point II on wall B) on both walls.
– Set up the tool 26 ft away turned by 180°
and allow it to level in.
– A l i g n
of the tool
by underlaying, if required) in such a
manner that the center of the laser line is
projected exactly against the previously
marked point II on wall B.
– Mark the center 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
B
t h e
l a s e r
w a l l
A
t h e
h e i g h t
( u s i n g
a
t r i p o d
and III on wall A indicates the actual
deviation of the tool from the level plane.
The maximum permitted deviation dmax is
calculated as follows:
dmax = double distance of the walls x 0.3
mm/m
Example: With a 26 ft distance between
the walls, the maximum deviation must not
exceed dmax = 2 x 26 m x 0.0036 in/ft = 3/16
in. Thus, the marks must not be more than
3/16 in apart.
Checking the Leveling Accuracy of the Vertical Line
For this check, a door opening is required with
at least 13 ft of space (on a firm surface) to
each side of the door.
– Position the tool on a firm, level surface (not
on a tripod) 13 ft away from the door
opening. Allow the tool to level in while in
cross-line operation mode, and direct the
laser beams at the door opening.
l i n e
a n d
o r
– Mark the center of the vertical laser line at
the floor of the door opening (point I), at a
distance of 26 ft beyond the other side of
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