The Fluke 393FC is the world’s first True-RMS clamp meter certified to CAT III 1500 V DC safety standard, custom-built for 1500 V high-voltage DC PV systems, lithium energy storage and other high DC voltage scenarios. The slim thin jaw reaches tight combiner boxes to clamp multiple cables, while IP54 dust/water resistance enables all-weather outdoor PV site operation. The supplied 1.8 m iFlex flexible probe extends AC current measurement up to 2500 A, ideal for irregular busbars and cramped cable trays. Exclusive DC power measurement and audio polarity alert quickly verify PV string positive/negative poles to prevent reverse connection burnout. Bluetooth connects to Fluke Connect mobile APP for on-site real-time data recording, storage and export, one-click PV acceptance reports. Rigorously certified for high voltage safety, it is an irreplaceable professional safe measuring tool for high-voltage maintenance of PV, energy storage and new energy vehicles,