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VERIFYING ACCURACY OF LASER LINES
Plumb Spot
Position instrument on the floor and project a spot with the plumb spot laser to the ceiling.
Rotate the laser by 180° and project the exact same spot to the ceiling. The distance d
should be ≤1/4" (6mm) for a 33' (10m) ceiling or ≤1/8" (3mm) for a 15' (4.6m) ceiling.
CEILING
d
180°
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