18V 2.0Ah 3 X 360° Green Beam Multi-Line Laser Level Kit DCE089D1G18-XE by Dewalt

Laser classes are categories assigned to lasers based on their potential to cause harm to humans, particularly to the eyes and skin. The classification system is designed to indicate the level of risk associated with the laser's power output and wavelength, guiding the necessary safety precautions for their use. The classes range from Class 1 (safest) to Class 4 (most hazardous).Class 1: Safe under all conditions of normal use. Used in CD/DVD players, laser printers, barcode scanners. No special precautions needed.Class 1M: Safe except when viewed with optical instruments. Used in fiber optic systems, measurement tools. Avoid using optical instruments to view the beam.Class 2: Safe for brief exposure due to blink reflex. Used in laser pointers, alignment lasers. Do not stare into the beam.Class 2M: Safe for brief exposure unless viewed with optical instruments. Used in alignment tools, rangefinders. Avoid using optical instruments to view the beam.Class 3R: Low risk of injury, up to 5 mW. Used in laser pointers, alignment lasers. Avoid direct eye exposure.Class 3B: Can cause eye and skin injuries, up to 500 mW. Used in research, some medical devices. Use safety goggles and avoid direct exposure.Class 4: High risk, can cause severe injuries and fire hazards, above 500 mW. Used in industrial cutting, welding, medical, research. Use protective equipment and follow strict safety measures.

Since brushless DC motors have no brushes to get worn out, they represent a huge leap forward in technology. Brushless motors have significantly higher efficiency and performance, and a lower susceptibility to mechanical wear than their brushed counterparts.The cost of a brushless DC motor is comparatively higher as compared to a brushed DC motor as it requires an electronic communicator, essentially a computer inside your cordless tool. This is what drives the cost of the brushless motor up.