Variable Technologies Node

by Dave Johnson ; Updated September 18, 2017

A smart sensor that fits in the palm of your hand.

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About the Author

Dave Johnson is editor of eHow's Tech channel, and the author of about 3 dozen books, including the best-selling, "How to Do Everything with Your Digital Camera." He has appeared in dozens of magazines and websites, including PC World, Wired, and CBS MoneyWatch.

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