Checking the Horizontal Leveling
Accuracy
A free measuring distance of approximately | A |
78 ft on a firm surface between two walls A |
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and B is required for the check. |
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– Mount the tool onto the holder or a tripod, |
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or place it on a firm and level surface close |
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to wall A. Switch the tool on. |
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B
A
B– Align the height of the tool (using the tripod or by underlaying, if required) in such a manner that the center point of the laser beam is projected exactly against the previously marked point II on wall B.
78 ft
–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
d 
180˚
B
A | B |
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.
–Rotate the tool by 180° without changing the height. Allow it to level in and mark the center point of the laser beam on wall A (point III). Take care that point III is as vertical as possible above or below point I.
–The difference d of both marked points I and III on wall A indicates the actual height deviation of the tool.
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). Thus, the difference d between points I and III should not exceed 9/16 in (max.).
Checking the Vertical Leveling Accuracy
For this check, a free measuring distance of approx. 13 ft between floor and ceiling on a firm surface is required.
–Draw a straight line on the ceiling.
–Mount the tool to the holder or a tripod. Switch the tool on and rotate it in such a manner that the bottom plumb beam can be seen on the floor.