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Free Shipping:30mW 405nm Open-back Violet Purple Blue Laser Pointer Pen(2 x AAA Included)
Specifications:
Well tested and high quality laser pointer
Easily to use, only need to push the button then you can see striking Violet Purple Blue beam of light shoot forth. The light can point at any targets, such as photos, blackboard, video monitors and so on
Best choice for teachers, professors, doctors, and so on
Clearly visible in the dark
Output Type: Fixed focus, continuous output and working time is long than ordinary laser pen
Wavelength: 405nm
Output Power: 30mW
Beam Distance: Over 800m(Under the influence of air quality, maybe can't)
http://www.uoften.com/30mw-405nm-open-back-violet-purple-blue-laser-pointer-pen-2-x-aaa-included.html
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