A smart water meter powered by the flow of water through it is said to be able to save users up to $135 a year on water and energy costs ...
http://www.treehugger.com/gadgets/self-powered-water-and-energy-meter-
A smart water meter powered by the flow of water through it is said to be able to save users up to $135 a year on water and energy costs ...
http://www.treehugger.com/gadgets/self-powered-water-and-energy-meter-
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