Smart pendulum system self-levels and indicates when conditions are out-of-level, Projects one horizontal line and two 90° vertical lines separately or together to plumb, level, align or square many applications, 50 Ft. maximum operating range; for indoor use only, Line generator laser level is great for a variety of projects, Includes BM3 positioning device with retractable feet, strong magnets and ceiling grid clamp for maximum versatility in all applications