George Yu can take your temperature from two feet away, scan your house for leaky insulation, and determine the dampness of your basement with a gadget he invented called the Node, which works with an iPhone. The three-inch tube, which he describes as “a little Swiss Army knife of sensors,” records the world around it and beams the data to the phone via Bluetooth. The Node has so far caught the attention of hobbyists, who’ve bought 450 of them. Now, Yu is marketing the device to industries ranging from home improvement to health care through his Chattanooga-based startup, Variable Technologies.
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