... . 240x160 LCD, dynamic display, easy to read I. IntroductionDF~300V Handheld Three~phase Meter is high accuracy, high stability, low power ... round & big ones apply to test the heavy gage wires.4. High precision, high stability, low power consumption.5. Safe, accurate ... error ±5° if current amplitude under 10mA). Best Voltage Meter, Handheld Three-Phase Meter DF-300V