JLT1129 Features: * Self-leveling laser set * Locking mechanism protects inner pendulum during transportation * Laser beam modes include dot, two adjustable line lengths and two rotation speeds * Visual and audible alarms when beyond leveling range * Height of Instrument/tilt alarm function ensures product accuracy * Green beam is 400pct more visible than red beam laser levels * Accuracy: +/-0.13""/100" Dimensions: * Interior range: Up to 400" depending upon light conditions * Dimensions: 7.95"" H x 6.29"" W x 8.62"" D