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Kill A Watt – power meter
The Kill A Watt (a pun on kilowatt) is an electricity usage monitor manufactured by P3 International. It has a large LCD display. It measures the energy used by appliances plugged directly into the meter, as opposed to in-home energy use displays, which display the energy used by an entire household. It displays voltage, current, true, reactive, and apparent power, power factor (for sinusoidal waveform), energy consumed in kWh and hours connected. Some models display estimated cost.[
via Kill A Watt – Wikipedia, the free encyclopedia.