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 2 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).
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
B
a1
b
A
B
a1
16' (5m)
18
19
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