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Step 1: Checking the Height Accuracy of the Horizontal Line
For this check, a minimum measuring distance of 16' (5m) from the instrument
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 close to 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 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
B
16' (5m)
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4. Rotate the instrument by 180°, allow it to self-level, and mark the center
of the horizontal line on the opposite wall B (point b).
A
2
a1
B
b
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