Calculates cost and forecasts by week, month, and year Displays eight critical units of measure on the large LCD display Built-in backup of accumulated information. Accurate within 0.2% Calculates cost and forecasts by week, month and year Now you can cut your energy costs and find out what appliances are actually worth keeping plugged in. Simply connect these appliances to the Kill A Watt EZ, and it will assess how efficient they really are. The large LCD display will count consumption by the Kilowatt-hour, same as your local utility, letting you calculate your cumulative electrical expenses and forecast by the day, week, month, even an entire year. Also check the quality of your power by monitoring voltage, line frequency, and power factor. Now you’ll know if it is time for a new refrigerator or if that old air conditioner is still saving you money. With the amazing Kill A Watt EZ you'll know "watts" killing you.