The Extech 380976-K is a professional-grade 3-phase True RMS power clamp meter kit designed for comprehensive electrical system analysis. It measures True Power (kW), Apparent Power (kVA), Reactive Power (kVAR), Phase Angle, Power Factor, Horsepower, and includes advanced functions like µA current (10nA resolution for flame rod tests), capacitance (up to 7000µF), resistance (up to 100MΩ), and Type K temperature. Ideal for motor/generator diagnostics, HVAC systems, and industrial power evaluation with CAT III safety rating.