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http://www.kitlaser.com/classification-by-safety-class-4.html
Optics and Huazhong University of Science and Technology School of Electronics and Information Engineering, Professor Li Zhengjia search for medical laser nearly 40 years. He told reporters that the burning blue laser pointer is parallel to the light, shooting within the divergence angle after the small injection is "courage". Convex lens this focus on the energy soon macular area, the power will be amazing focus. More than 3 mW laser pointer, it can cause permanent damage to macular adults. Children in the eyes of the delicate fabric, and can withstand a little low, about 1 milliwatt of laser directly in the eyes, enough to burn the child with eyes. 100 yuan to buy charging green laser pen, 357,000 kilowatts of maximum power, far more than the standard toys.At present, there is no laser pen to buy more than nine brands of Chengdu, China's label, size tag no power. How is the safety of these laser pointer?
http://www.kitlaser.com/what-is-the-real-purpose-of-the-laser-pen.html
Teachers, salespeople, doctors use three high-frequency laser indicators to occupy the 2000mw laser pointer, the reporter borrowed from the Geological Senate Center, the sales and the University of Wuchang Hospital of China.According to a strong laser pointer sold around the school, at a stationery shop, the reporter bought a laser pointer and a wireless laser pointer from $ 12 to $ 100. Among them, only China Laser Indicator Geological University Education Center has a regular brand.After all, the laser pointer puts a new battery, battery and a half hour laser pointer, using a laser pointer that is tested in the optical power meter 5 to charge.
http://www.kitlaser.com/safety-class-3b-classification.html
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