Johnson's 40-6543 Rotary Laser Level with Greenbrite Technology is superior for indoor construction laser levels - carpenters, plumbers and electricians LOVE this rotary laser level for the visibility and accurate leveling it provides. Self leveling in the horizontal position, with the Green Laser Beam 400% brighter than red beams this makes leveling tasks fast and accurate. Still deciding? Rotary Laser Level Features: Green Beam is 400% brighter than red beam Self-leveling in the horizontal planeLocking mechanism protects inner pendulum during transportation Manual-leveling in the vertical plane with 90¡ split beam Laser beam modes include dot and two adjustable line lengths Visual and audible alarms when beyond leveling range Leveling Method: Self-Leveling (Pendulum) Laser Wavelength: 532nm /-10nm (Green) Laser Classification Class: IIIa Maximum Power Output: <=5mW Accuracy: /-1/8"/100ft. ( /-1mm/10m) Interior Range: Up to 400` diameter (120m) depending on light conditions Exterior Range: Up to 1,200` (400m) diameter (detector not included) Remote Range: Up to 200` diameter (60m) with remote Auto-Leveling Range: /-3.5 degrees Power Supply: Rechargeable NiMH battery pack, or 6.4V adapter (included), 4 "C" alkaline batteries (not included) Battery Life: Approximately 16 hours with rechargeable battery pack Dimensions: 7.087" x 6.378" x 7.953" (180 x 162 x 202mm) Weight: 4.409lbs. (2kg) Working Temperature: 32F to 104F (0C to 40C) Center Screw Thread: 5/8"-11 Scanning Modes 0, 30, 60 degrees Rotation Speeds 150, 200, 250, 300 rpm IP Protection Class: 66