The Peacefair PZEM-004T AC Energy Meter Module is a single-phase energy monitoring device that measures voltage, current, active power, frequency, power factor, and energy consumption. It supports 80–260 V AC and up to 100 A using the included CT coil. With TTL serial communication, it can be easily interfaced with Arduino, ESP32, Raspberry Pi, and other controllers. Ideal for home energy monitoring, IoT projects, industrial applications, solar systems, and smart metering.