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A variety of companies in the United States and the United Kingdom offer off-the-shelf, power-monitoring devices for home use.
Among the brand names: Kill A Watt, Watts Up, Power Cost Monitor, the Energy Detective (TED), the Owl and the Wattson.
Prices vary from about $40 to more than $400, depending on features. A Web search of a brand's name will turn up multiple online vendors. Home Depot carries the Kill A Watt meter, shown at left.
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