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20mW Green laser Pointer Pen are helpful when giving a presentation. Just don’t let the beam hit you in the eye—especially when it’s green. The National Institute of Standards and Technology says that nearly 90 percent of commercially available green pointers and about half of red pointers they tested are too strong and violate federal safety regulations.
When handheld lasers first came onto the scene, they were expensive and not very powerful. In recent years, they have become stronger and more easily accessible. laser pointer 300mw are now so powerful that even the handheld ones can do permanent damage to somebody standing 10 miles away. And that, by any definition, by any standard, is a weapon. And dangerous weapons — ones that can permanently and irreparably injure somebody standing literally on the other side of Black Rock City — really have no place at Burning Man.
In addition, children also curious what the hell laser pointer is and would try to prove it themselves. For instance, can laser pointer travels as long as it introduces or can it really point at aircraft in the sky? Is it true that laser pointer can make temporary or permanent blindness? What’s worse, they even try to test what they heard of by others or the internet. There are many aviation and non-aviation incidents happened due to children’s misusing of laser pointer. One can never image how powerful the laser pointer is and how horrible incidents it causes. A ten years’ girl tried to change her eyes color by shining a 10mW blue laser pointer into eyes directly, she felt uncomfortable when doing it several minutes later but with the belief it would successful and lead to left retina was burnt and lose sight since then. The harm of laser pointer 100mw brings is incurable, there has no way to regain sight any more. She was very regretful to do such stupid thing but it was too late.
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Green lasers use a shorter wavelength of light than red ones, making them brighter and more dangerous. The darker part of the retina heats up from the green laser’s intense, yet invisible, infrared light, which can cause retinal scarring and even blind spots. Because the damaging wavelengths are invisible, the eye’s natural defense mechanism—its eyelid—doesn’t close to provide protection.
A 30mW Green Laser pen fosters the detachment of the presenter from the presentation. This is unfortunately the standard presentation mode by the entire community without anyone ever having made a conscious choice about it and has broader sources than just laser pointers.
The laser pointer safety testing report could also be used by retailers who sell laser pointers (manufactured by other companies), to demonstrate they are selling a product that meets the U.S. CDRH or other global requirements for laser safety.
http://www.lasereshop.com/green-laserpointer/p-120.html
http://www.nostre.com/blogs/post/9504
http://www.masterpeace.org/blogs/post/for_years_pointing_a_ultra_powerful_laser_pointer
