Our review:Item Description: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
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Buyer Testimonials
Average Buyer's Review:
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See where your electrons are going
Using this watthour meter you can easily see how much electricity every "pluggable-innable" device uses. It might be an eye-opener.
Also, for those so inclined, you can read watts, volt-amps, and power factor in addition to KWH and the number of hours connected.
Buyer's review: -
Buy this toy
This works just the way they say. I am still testing all my appliances. This is a toy that helps you save money.
Buyer's review: -
Worth the money!
This is a very informative tool. We ordered two, one for ourselves and one for a gift. It is easy to use and will help us make decisions about how we use our electrical products. We expect to minimize our use of electricity and thus save money. Highly recommend.
Buyer's review: -
Great Device - Great Savings Tool
I purchsed this item in July 2008; after many months of watching my appliances & devices, I've cut my electric bill by about 35%.
No issues with the device, just plug in and go.
If you have an appliance that you wonder about, you can leave it plugged into the kill a watt; and allow it to log usage -- this is helpful in determining as in my case if an appliance is just so old that it's an energy hog. My refrigerator I replaced as a result of using this method, it used enough in a month to warrant replacing with a new model; and will pay for itself in about 8 months from the energy savings -- and the bright side, I now have an ice maker.
I'd recommend doing just that on refrigerators; since they cycle on/off constantly throughout the day, You'll not have to *guess* how much it runs, or if your measure with the kill a watt was when the compressor was off; and have a false sense that it's a saver.
Buyer's review: 
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Does the job
This is a simple & affordable unit that you plug your 120v appliances into and get various electrical information.
Works well, look for better prices on other sites, I've seen it for $16.
There are 2 problems with the Kill-A-Watt:
1. It only works for 110-120VAC, not for 220-240VAC.
2. When plugged into a double outlet wall plug, it is so large that it will not allow anything else to be plugged in on the other socket.