Bosch GPL5 5-Point Alignment Laser BNA Integrated reference lines for precise positioning of tool and transfer of points Easy field recalibration maintains accuracy and prevents downtime Pocket-sized measuring 4 1/8-inch tall with pouch that fits on tool belt Pendulum leveling system self-levels, senses and indicates out-of level condition, locks when off Multipurpose attachment positions and mounts with magnets, strap or threaded mounts (1/4-20, 5/8-11) Class IIa laser product, &lt;1mW power output