The Three-phase Multi-function Meter category encompasses advanced metering devices designed for precise measurement and monitoring of three-phase electrical systems. These meters typically feature capabilities such as voltage/current measurement, power factor calculation, energy consumption tracking, and harmonic analysis. Common products in this category include DIN-rail mounted multi-function meters, panel-mounted power monitors, and portable three-phase analyzers. Key technical specifications often include 0.5S accuracy class, MID certification for billing purposes, RS485 communication with Modbus protocol, and optional GSM/GPRS connectivity for remote monitoring. These devices serve critical functions in industrial automation, power distribution systems, and energy management applications by providing comprehensive electrical parameter measurement and power quality analysis.