Instruct: Classify a review as either positive or negative.
Query: Useful, but not perfect

Very useful for determining the amount of energy used by major appliances. I like the fact that it keeps track of total energy consumption and uses the actual energy cost to forecast the cost of operation. This information is very useful when targeting appliances to reduce energy consumption. It is also useful for evaluating how successful I am at reducing energy consumption.I don't like the fact that the LCD does not have a backlight, and that the display can only be read while the unit is plugged in. I have to get on the floor to read it. The unit also blocks both outlets.I recommend getting a couple of extension cords and using this device "in line". Use one cord from the kill-a-watt to the wall, so that it's easier to read, then another cord from the kill-a-watt to your appliance (not needed if your appliance has a long enough cord).