Penny pinchers rejoice! The Wattson displays your total power usage. Installation is simple and no professional needed. Just install the ‘sensor’ at the home’s electricity supply and then carry the handheld wireless display wherever you go. Turn on the good old hair dryer and watch the numbers spike. The display has two modes: Wattage usage or money per year you’d spend for the appliances turned on. Lastly, the Wattson can be plugged into a computer and its information uploaded to the Internet where you can share consumption, tips and tricks.
DIY Kyoto Device [MakeZine]