The Kill A Watt™ Electricity Monitor measures electricity usage in your household appliances. The LCD display will show the power consumption by the kilowatt-hour. Can be used to test TV's, toaster ovens, microwaves, air conditioners and more. See how much that old frig is really using. Maybe it's time for a new one, or not. Great for kids to understand energy use, and the knowledge gained can help us all to save energy and money.