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Features: Dual LED: Red voltage and current, Display Voltage Current on one screen. this panel meter is common ground design, it means that the ( measure ground wire) and (power supply ground) is common ground. Power Supply DC 4.5-30V. With reverse polarity protection, but the max power supply can not exceed 30VDC. Specific: Power Supply (Measure Voltage): DC 4.5-30V voltage < 10V, resolution: 0.01V voltage >= 10V, resolution: 0.1V Measure Current: 0-2A forward current ( built-in shunt, can measurement directly ) Current Resolution: 0.01A Operating Current: