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http://www.kitlaser.com/how-much-laser-pen-is-needed-to-form-a-deadly-weapon.html The principle of laser pen and how to choose A laser pointer is a tool that USES lasers as instructions.Can indicate the length of the more far, can replace the pointer indicating tools such as, can also be used, such as playing slide PPT for instructions.Use a laser pen, can see light spot in a few metres away, thus the laser pen are commonly used for instruction.