Kapro Prolaser Multi Beam Manuel D'utilisation page 22

4. Checking plumb accuracy
For this procedure a room with approx. 5m distance
between floor and ceiling is needed.
1. Place the laser level on the floor.
2. Unlock the pendulum and press the beam selector
button to project the plumb laser dots on the ceiling and
on the floor.
3. Mark the center of the upper plumb dot on the ceiling
as point a1. (See Figure 9)
4. Mark the center of the down plumb dot on the floor as
point b. (See Figure 9).
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