SELF-LEVELING & 2 SELECTABLE MODES: In Automatic mode, self-leveling mode is available with a slope range of 4. the laser will self-level. Otherwise, beyond 4 of slope, the laser beam flashes to trigger an alarm to show that it is no longer level. Lock the pendulum to enter manual mode, the automatic leveling function is deactivated and locked so that the device can be used from all angles. HIGH VISIBILITY AND PRECISION: Thanks to the powerful laser diode, the laser lines are extremely visible and easily project a bright red cross at an angle of 110. Horizontal Line Accuracy: 2mm/10mradius. Line accuracy vertical: 2 mm / 5 m (radius). Range: 15 meters. Ideal for construction work: also can be installed on a 1/4 " tripod (not included). can be rotated 360 freely for your work. ROBUST DURABILITY anti-fall: IP54 protection against dust and water guarantees work in difficult conditions. Six-sided above-ground drops of 1 meter without loss of functionality or accuracy.