... display (VFD)True-rms AC voltage and current measurement, with high frequency of 100kHzMaximum reading of ... (RFL) mode to eliminate residual reading2W and 4W resistance measurement modes selectableBuilt-in mathematics calculation functions: mX+b, ... recalled up Measurement functionMeasurement parametersDC voltage, AC voltage, DC current, AC current,2-wire resistance, 4-wire resistance, frequency, ...