Features: Voltmeter ammeter voltage ranges is 50-500V, current ranges is AC1-100A. Display voltage and current simultaneously in different color, red for voltage, green for current. The monitors is powered by the circuit being measured, no need to connect power sources. This meter is only applicable to three-phase, generators, voltage regulator and other sinewaves alternating current, not applicable to non-sinusoidal, high-frequency and voltage regulator and other occasion. If you have questions，contact us. Specifications: Material:ABS Voltage-Measuring Ranges: 50-500V Current Measuring Ranges: AC1-100A Cable Length:Approx.18cm/7.08'' Size:Approx.45x26x14.5mm/1.77''x1.02''x0.57'' Package Includes: 1x Digital Voltmeter Ammeter note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.