Digital electric meter instantly displays wattage used by any standard AC device plugged into this power meter. Instantly see the cost in dollars and cents on Watts Up display. See in conversion, just how much money appliances are costing you, even when not in use.
Main display modes show 6 values. Detail mode give additional information. Clear English wording on LCD describes the displays.

Watts Up? measures voltage and current thousands of times per second. This fast response time shows the peak surge power display of power when appliances are first turned on. The peak value display captures the surge display no matter how fast the surge occurs. The minimum voltage display shows both line quality and voltage dips. Minimum current and minimum watts displays monitor variances in appliances that run continuously.

Watts Up? measures true RMS power (including power factor). Electric bills are based on true RMS power, which can differ from a simple voltage and current measurement ("apparent power"). Duty cycle display shows the percent of time a load is above a preset threshold level. For instance, set this threshold to 100 watts for a refrigerator and the duty cycle display shows the percent of time that the compressor is running. A high reading may indicate a bad motor or low freon.