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The claims. "Learn which appliances are costing you the most!" says the maker of Kill A Watt P4400, below left. Watts Up, below right, offers "a convenient way to monitor and project energy costs."
The devices work in much the same way: You plug any 120-volt AC appliance into the watt meter and plug the meter into a wall socket, and the meter starts counting wattage use. You can leave meter and appliance connected for as long as you typically use the appliance: all day for a fridge, or an hour while a space heater warms a room, for example. The meter's readout tells you how much electricity the appliance has sucked up during that time. Watts Up also figures out the cost of energy use for you, after you've entered your cost per kilowatt-hour into the meter. With Kill A Watt, you do the math, multiplying the kWh reading by your cost per kWh.
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Both devices are sold only online. Kill A Watt costs $25; Watts Up, about $96.
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