"The Rotary Laser Level features self-leveling in the horizontal plane and manual-leveling in the vertical plane with 90 split beam. Illuminated vertical vial. Visual and audible alarms when beyond leveling range. Accuracy 1/8 in./50 ft., Laser Wavelength 635nm10nm, Exterior Range ft. Up to 800, Single, Pair, or Set Set, Indicator Type Visual, audible, Battery Type AA, Self Leveling Range 3, Laser Output Locking mechanism protects inner pendulum during transit"
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