This multifunctional AC digital power meter features a high-definition color backlit LCD screen that simultaneously displays six key electrical parameters: voltage, current, active power, accumulated energy, frequency and power factor, enabling users to intuitively monitor real-time power consumption of household appliances, circuit equipment and power supply systems within an AC voltage range of 80V to 260V. Two optional current specifications (0-10A and 0-100A) are available to meet different load testing demands from small household devices to high-power electrical equipment. Built with an intelligent overload alarm function, the device can set a custom power threshold; once the actual load exceeds the preset value, the screen will flash to send an alert, effectively avoiding safety hazards such as circuit overload, equipment burnout and short circuits. It supports power-off data storage and manual energy data reset, which facilitates regular electricity cost statistics, energy consumption comparison and equipment power performance testing without worrying about historical data loss after power failure. Designed for standard DIN rail installation, the compact plastic housing can be easily mounted inside distribution boxes, switch cabinets and control panels, saving installation space while providing stable protection against dust and minor electrical interference. Adopting high-precision sampling chips, this power monitor ensures stable measurement accuracy for long-term continuous operation, widely applicable to household electricity consumption monitoring, photovoltaic inverter parameter detection, laboratory electrical testing, industrial equipment load inspection and energy-saving renovation data recording.