Bosch Red 30-ft Self-Leveling Indoor Cross-line Laser Level with Cross Beam Model #GLL 30 The Bosch GLL 30 self-leveling cross-line laser projects two lines, making a cross-line projection, for a wide array of level and align uses. This versatility makes it more valuable than a typical line laser. With top-notch accuracy and one-switch operation, the user's leveling and alignment tasks are done quickly and correctly. The laser lines are visible up to 30 Ft. The smart pendulum system self-levels and indicates out-of-level condition with a blinking cross-line to help ensure an accurate layout. The pendulum system locks when switched off, to assure secure tool transport. The included MM 2 flexible mounting device provides microfine height adjustment, and it allows the laser to be clamped on virtually any surface from 1/2 In. to 2-1/4 In. thick, for level lines at any height. Features: Cross-line mode ? projects two lines that are precisely level and plumb, for a wide array of level and alignment applications. Accurate lines ? projects visible laser lines up to 30 Ft with an accuracy of 5/16 In at 30 Ft of length. MM 2 Flexible Mounting Device ? clamps to multiple surfaces and provides a rotating 360-degree neck for quick setup and simple fine-tuning. Smart Pendulum System ? self-levels and indicates out-of-level condition with a blinking cross-line. Secure transport ? pendulum locks when switched off, to help ensure long tool life. Ergonomic, compact, and lightweight ? easy to use, easy to store. Features 1/4 Inch 20 tripod thread ? for use with MM 2 mount or tripod. Versatile clamp ? stable grip on thin and thick surfaces from 1/2 in to 2-1/4 in thick.