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What more needs to be said. The Kill-A-Watt is great at what it can do.
It's easy to use, and for appliances that have a flat use (they're either on or off) it can instantly tell you how much energy they draw and from that you can figure out how much it would cost per day. And you may want to turn off that powerstrip when you shut your computer down. For refrigerators, or other things that run intermittently, you have to leave it plugged in for 24 hours or more to get a better average reading. It certainly opens your eyes to how much that cable box is still eating up when you are not even watching television.
This tool will answer power consumption questions eg Should I leave the computer on when I'm not using it. This is limited to 15 amps at 115 volt appliances). Or, How much electricity does my TV use when it's on or when it's off. (They need to make one for 220 volt use also.
The idea is to get the accumulated electricity use over a day or week, but if the device get disconnected from the wall socket or extension cord while wrestling with its awkwardness, all the counters reset to zero. Its not obvious from the photo that the other electrical connection is on the back and will block both sockets in an electrical outlet. The meter works as advertised and gives the the data I want, but it is unnecessarily awkward and difficult to use. The rear plug stands out from the back, so if you use an extension cord, the device won't lie flat nor stand up. Next time need a product like this, I will look for a different device. The final annoyance is that the device has no memory if it is disconnected.
This thing works amazing if you are looking for power hungry gadgets in standby or are just curious how much power a device uses+ Inexpensive+ Measures pretty much anything you could imagine, including Power Factor, which in helpful in adjusting the PF for your entire house+ Actual kWh measurement is really helpful to easily calculate the monthly or yearly cost of a gadget+ Very simple to use- Screen definitely needs a backlight of some sort, trust me you will need a flashlight- A battery backup would be nice, but not necessary, to store some information
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