Clamp Meters, also known as clamp-on ammeters, are essential electrical test tools designed for measuring current without disconnecting the circuit. They feature a hinged jaw that clamps around a conductor, enabling safe and efficient AC/DC current measurements in industrial, HVAC, and maintenance applications. Key variants include True-RMS models for distorted waveforms and high-precision models for sensitive equipment. Some advanced versions integrate multimeter functions (voltage, resistance) for versatile diagnostics. Clamp meters prioritize safety with CAT ratings, rugged designs, and non-contact operation, making them indispensable for live electrical systems.