Connect your appliances into the Kill A Watt, and assess how efficient they are. A large LCD display counts consumption by the Kilowatt-hour just like utility companies. You can figure out your electrical expenses by the hour, day, week, month, even an entire year. Monitor the quality of your power by displaying Voltage, Line Frequency, and Power Factor
Customer Rating: 
Summary: What a great device!
Comment: This device will tell you how many kilowatts it takes to run an appliance. With a few calculations you can see how much a month your electrical appliances are costing you. My shop mini fridge ($4.00) a month, my pool pump at 12 hours a day ($45.00)a month.
This is actually my second kill a watt monitor I burned the first one up on my pool pump which exceeded the recommended amperage.
Customer Rating: Summary: Great Product, helped me save $10 per month
Comment: This product was very helpful, on the first day, I went through the whole house including the garage and checked every outlet. in some cases I needed an extension cord to be able to use the tester over a period of time. You can set it up to calculate how much energy is used over a period of time like an hour or several hours. I noticed that by turning off the directTV box with DVR that we could save over 100 watts per hour. We used to leave it on all the time but not any more. Also an ordinary DVD player used over 100 watts per hour in standby mode, it looked like it was off but still used energy. we used a power strip and turned the switch off. I was surprised that a window air conditioner used almost the same amount of energy between low medium and high. Some computer related stuff like monitor, printer, cable modem, etc used energy all through the night even when we weren't doing anything. there is a power strip device that senses how much energy is being used during normal operation and when you turn it off, it will power down the other outlets. I will be buying that next.
Customer Rating: Summary: P# kill a watt
Comment: does what it made to do but could be smaller/more user friendly, It meets my intended purposes and I would buy one again
Customer Rating: Summary: great for the price
Comment: works well, as advertised. Very easy to use.
My gripe is that it cannot handle larger loads >15 amps or 220 volts.
Would be nice if it was 110/220 compatible.
Customer Rating: Summary: Quite Useful
Comment: Works marvelously. It's reassuring to know that my iMac with an extra display and various gadgets only draw 125 watts. The digital display reads power with enough sensitivity even a small accessory's power draw shows up. And if you want to know how much your cell phone charger draws, it reads even very low power draws.
--Mike Perry, Untangling Tolkien: A Chronology and Commentary for The Lord of the Rings
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