Measure normal parameter of power line: Vrms, irms, frequency Active power, reactive power, apparent power Phase angle between voltage and current Power factor Calibrate single phase meter; Measure harmonic of voltage and current; Measure waveform of voltage and current; Measure current transformer¡¡¥s ratio (option); Energy accumulation test; Built-in clock, record testing time exactly; Store, check and transmit the measured data; Connected to pc, reading recorded data and real-time measured data by pc; Alarm when the tested voltage and current over the testing range; Connected to portable printer (option).