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The use of laser pointers： Teachers / lecturers, as the laser pointer, used in classroom teaching, make you in any corner of the classroom can easily show the blackboard is definitely the teachers assistant!The laser power for this purpose is generally less than 30mW. Business people / conference speakers – for product presentations and conference ...
Demonstrators used laser pens to light military helicopters Protesters gather outside the presidential palace in Cairo, Egypt, on June 30, 2013, demanding that President Mulsi step down, and some protesters use laser pens to illuminate military helicopters in the air. Picture source: KHALED DESOUKI
