Laser Pointers 20. It is difficult for many people to believe that a device that looks like an ordinary pen-light and runs on a couple of AAA batteries can be dangerous. However, within the device is a small yet power laser diode.
Laser classification gives an indication to their degree of hazard.
Eye damage is usually avoided with a class 2 laser by your blink reflex or aversion response. A class 3A laser pointer has the potential to cause eye injury, especially in the hands of an unaware, untrained, or careless operator. Laser pointers should be handled with respect, since their associated hazard, although low is not zero. The beam should never be intentionally aimed at people. Laser pointers of Class 3A or above, should not be used within the Australian National University.