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Vertical Leveling Accuracy
A door opening with approximately 8' of space on
each side of the opening is required for this check.
1. Securely mount the tool 8' from one side of the
door opening.
2. Turn the tool to
Plumb Points Mode or Perpendicular Level, Plumb
Points, and Horizontal Points mode.
3. Position the tool with the laser towards the door
opening. Allow the tool to self-level.
4. Mark the center of the vertical laser line on the floor
in the middle of the door opening (point I), at a dis-
tance of 8' beyond the door opening (point II), and
at the upper edge of the door opening (point III).
5. Move the laser level directly behind point II on the
other side of the door. Align the vertical laser line
so the center is directly aligned with points I and II.
6. Mark the center of the vertical line at the upper
edge of the door opening (point IV).
7. Measure the height of the door opening.
8. The distance between points III and IV on the
upper door opening is the vertical deviation (d)
of the tool.
9. The maximum vertical deviation (d) is: dmax = 2
x H (door opening) x ±1/8" ÷ 33'.
Example: for a door opening height of 7', the
maximum permitted deviation (d) is: dmax = 2 x
7' x ±1/8" ÷ 33' = ±0.05"
Therefore, the measurement between points III
and IV on the upper door opening should not
exceed 0.05" in a 7' doorway.
ON and to Vertical Plumb Line &
Plumb Dot Accuracy
A free measuring distance of approximately 16.5'
between floor and ceiling on a firm surface is required
for this check.
1. Place the tool within 1' of the floor.
2. Turn the tool to
Mode or Perpendicular Level, Plumb Points, and
Horizontal Points mode.
3. Set tool on ground and mark the center of the
plumb point on the ceiling (point I). Also, mark the
center of the plumb point on the floor (point II).
4. Rotate the tool 180°. Align the center point of the
laser beam directly onto the floor point II.
5. Mark the center of the top plumb point on the
reference line on the ceiling (point III).
6. The distance between points I and III on the ceiling
is the deviation (d) of the tool. This distance should
not exceed 1/8" (max.) at 33'.
For the Measuring distance of 2 x 16.5' = 33', the
maximum allowable deviation (d) is: 33' x ±1/8"
÷ 33' = ±1/8".
Squaring Procedure
1. Mark a reference (point x) on the floor that is
equidistant from each wall in the center of a room.
Turn
ON the laser and switch to the "Unlocked"
position. Ensure that laser is in Perpendicular
Level, Plumb Points, and Horizontal Points mode
(all lasers ON). Using the down plumb point, align
the laser directly over the center of point (x) on the
floor. With the laser in place, mark point (I) at the
intersection of the lines directly in front of the laser
on wall A. Without moving the laser, also mark the
center of the right Horizontal point (II) on wall B.
6
ON and to Vertical Plumb Line
16.5'
d
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