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WattsUp? Pro Power Meter

Photo of a WattsUp? Power meter. Meter has a small digital screen and two small buttons on the front.

Plug the WattsUp? Pro into the wall outlet and plug the appliance into the WattsUp? Pro. The meter is capable of displaying instantaneous power, cumulative energy use, time, root mean square (RMS) voltage and current, power factor, duty cycle, and cost information. It has internal memory so data is stored even when power is lost as well as additional software and Universal Serial Bus (USB) interface to a personal computer so it can be used for real-time data.