Self-Leveling plumb bob is accurate to ° 0, 2mm/m Self-Leveling up to 5° surface angle, finds plumb in seconds - no vials or knobs to adjust One button operation is fast & easy to use Focused laser beam keeps dot small even over long distances for improved accuracy & visibility Cross-hair beam pattern helps user find center of beam Rubber overmolded housing helps maintain calibration under jobsite conditions Locating magnets hold Laser Plumb Bob to metal track for easy posit