This power supply is a multi-functional AC power supply integrating voltage, current, power, and power factor. Equipped with a high-speed processor inside, it is cost-effective and highly stable, widely used in production lines, laboratories, and quality inspection departments in fields such as lighting enterprises, power tools, household appliances, motors, and electrical appliances. It features digital display, with four windows simultaneously and quickly showing true RMS voltage, true RMS current, peak current, power, power factor, and frequency; automatic conversion of voltage and current ranges to improve measurement accuracy; measurement accuracy not affected by waveforms; high reliability and long service life; freely settable upper and lower limit parameters, which can improve efficiency in batch testing.