BOSCH GLL30 Self-Leveling Cross-Line Laser projects two lines, making a cross-line projection for a wide variety of level and align uses. BOSCH GLL30 Self-Leveling Cross-Line Laser features top-notch accuracy and one-switch operation that are visible up to 30ft. BOSCH GLL30 Self-Leveling Cross-Line Laser features Smart Pendulum System self-levels and indicated out-of-level conditions to help ensure accurate layout and locks when switched off. BOSCH GLL30 Self-Leveling Cross-Line Laser includes a MM 2 Flexible Mounting Devices allowing the laser to be clamped onto virtually any surface.