Self leveling 4 beam laser is accurate to ±0.2 mm/m. Self leveling up to 4 degrees surface angle, finds plumb in seconds - no vials or knobs to adjust. One button operation is fast and easy to use. Focused laser beam keeps dots small even over long distances for improved accuracy and visibility. Over molded housing helps maintain calibration under job site conditions. Locating magnets hold laser to metal track for easy positioning. Heavy duty carrying case protects unit and helps maintain calibration when stored in gang box.