For those who use laser pointer for presentation, u may want to free your hand for controlling mouse, turn to some pages.....this laser ring can free your hand and even can control it properly with your other hand.I made some designs, and this it the one made from a wooden block.+++++++++++++ how to...By: kokpat
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from Instructables: exploring - technology - robots http://ift.tt/16Wbugd
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