2-in-1 5mw 532nm Green Laser Pointer and Kaleidoscope Laser Pointer Pen
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Recently, I am preparing for a public class. The biggest headache problem is that how to control the PPT when I stand far away from the stage. I think it is not a good idea to stand in front of the screen all the time. My colleague told me that a green laser pen could deal with the problem. It is evident that laser pointer is a good choice for teachers.