Bosch Self Leveling Cross Line Laser GLL 30 CROSS-LINE MODE: The Bosch GLL 30 projects two very bright laser lines, making a cross-line projection for a wide array of level and align uses. CONVENIENT: Includes Smart Pendulum System that allows laser tool to self-level while also indicating out-of-level condition to help ensure an accurate measuring. Manual mode locks laser lines at any angle. SECURE: Smart Pendulum Leveling System ensures secure tool transport by locking and protecting pendulum when unit is switched off. ACCURACY: The Bosch GLL 30 laser's thin lines are highly visible up to 30 feet and offer accuracy of 5/16-Inch at 30 feet. COMPACT: Features small dimensions and a ergonomic, handy pocket-size design so the GLL 30 can fit in any pocket. Class IIa laser product, &lt;1mW power output