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Step 2: Checking the Levelling Accuracy of the Horizontal Line
For this check, a 16' (5m) or 30' (9m) distance to the opposite wall in a dimly lit room
is required.
1. Place the instrument on a firm and level surface or mount the instrument onto a tripod
at the specified distance from wall A.
2. Turn on the instrument in the self-leveling mode by sliding the Pendulum Switch
to the UNLOCK position.
3. Direct the laser beam against wall A (Pos.1) and allow a few seconds for the visible line
to stabilise. Mark the center of the horizontal line projected by the instrument on wall A
(point a1).
A
a1
Pos.1
16' (5m)
22
4. Swivel the instrument 45° to the right to position 2 (Pos.2) and mark the horizontal
line projected by the instrument on wall A (point a2).
5. Swivel the instrument 90° to the left to position 3 (Pos.3) and mark the horizontal line
projected by the instrument on wall A (point a3).
2
a1
A
a3
a2
a1
a3
Pos.3
Pos.3
Pos.2
Pos.2
23
a2
d1
d2
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