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![Laser pointer - Wikipedia, the free encyclopedia](https://www.iarticlesnet.com/pub/img/site/s_33.jpeg)
Laser pointer - Wikipedia, the free encyclopedia
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日期:2024-07-05
A laser pointer or laser pen is a small handheld device with a power source (usually a battery) and a laser diode emitting a very narrow coherent low-powered laser beam of visible light, intended to be used to highlight ......看更多