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Features:
• One self-levelling horizontal line in the front and one vertical line makes a cross line in the front.
• One beam shoot out a line on the ceiling makes a cross line on the roof.
• One beam shoots out a dot from the bottom of the same unit.
• The cross line point on the ceiling and the dot on the ground are plumb.
• One locker on the side will be able to avoid the accuracy effected from shake or moving around.
• The body of this product can be rotated 360 degrees.