KVA meters measure the apparent power of AC devices in kilovolt-amperes (KVA). Apparent power is the combination of a circuit’s true power and reactive power. True power is the actual power dissipated in a circuit. Reactive power or imaginary power indicates how a reactive load drops voltage and draws current, but does not actually dissipate power. Bandwidth, sampling rate, maximum channels and operating temperature are also important specifications to consider. Bandwidth is the frequency range for AC current or voltage to be measured. Sampling rate is the frequency that a digital meter tests an analog signal and converts to a digital value. Maximum channels for KVA meters range from 2 to 24. Operating temperature is expressed as a range.