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Promoted item:Powerful Green Laser Pointer Pen Beam Light 5mW Lazer High Power 532nm

Powerful Green Laser Pointer Pen Beam Light 5mW Lazer High Power 532nm

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  • US $7.55
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About Laser Pointer

Laser pointers are handheld small, portable, pen-shaped devices that emit a beam of light, to draw ones attention to a specific area or projected image. The light of a laser is not visible unless the small point of light intersects a surface. There are a few exceptional high-powered green and red lasers which are able of emitting a beam of light in moderately lit to dim conditions. Initially, laser pointers were small gas lasers of helium-neon, which were fragile, expensive, bulky and short on battery life. These units produced an orange-red light with a 633nm wavelength; its light was several times brighter than 670nm light and was easily visible. Earlier lasers were limited in their use but with the progress in technology and development of lasers, their use too has changed. Laser pointers today use 635 nm diodes which are convenient and slim penlights that operate on two AAA cells that last for several hours. Recently, green solid-state 532 nm wavelength neodymium-yttrium pointers were introduced; they are pleasing and quite bright with nearly 20 times more brightness than 670 nm units. Green lasers always appear brighter than other colors at similar output power levels, as the human eye is more sensitive to the green area of the spectrum. Laser pointers are used in a variety of fields. Commonly used in business, school and visual presentations, construction projects, museums, art galleries, jewelry, and retail stores. Red laser pointers are used for almost any low-light indoor situation that requires highlighting which may not be convenient to point by hand, such as interior decorating or construction work. For outdoors, daylight or long distances, green laser pointers are used. Laser pointers serve as excellent toys for pets, as dogs and cats generally have an urge of chasing light which moves around. Laser pointers can also be fixed on carbines and pistols as an aiming tool. Green lasers are also be used for sky gazing. The beam of a green laser pointer can often be used to point out individual stars on a clear moonless night.