... adjust the voltage and frequency. 2.High precision, screen digital display: frequency, voltage, current, power, power factor. 3.Quick response for status, ... 2msIndicaor/resulutionFrequency4 digital resolution 0.1HzVotlage4 valid digital value resolution 0.1VCurrent4 valid digital value resolution 0.1APower4 valid digital value resolution 0.1WPower factor4 digital resolution 0.001Protection ...