The LMH-C Electronic Self-Leveling Rotary Lasers offer fast and simple leveling power to handle your toughest indoor/outdoor jobs with less manpower. Single Beam Offers 600 RPM Rotation for Optimal Use with Detector or Depth Sensor. Anti-Drift System to Signal Operator When Unit is Moved Out of Position Automatic/Manual Mode. No Bubble Required – Wide Self-Leveling Range of ±5º (1º per Second in Horizontal). Low Battery Indicator So You Don’t Run Out of Power at the Wrong Time. Heavy Duty Glass Enclosed Beacon and Durable Sealed Housing is Water and Dust-Resistant (IPX4) to Ensure Years of Dependable Operation. Pro Grade – Motorized, Electronic Horizontal Self-Leveling.