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121502 3-Digit DC LED Double-Display Voltage Current Meter - Black
Perfect functions in one set of voltage and current meter£¬ measuring current power from the measuring circuit£¬ no separate power supply isolated power supply On-Board wire information: Thin red wire VCC: Power supply input positive (3.5~30V) Thin black wire GND: Power supply input negative (3.5~30V) Thin yellow wire VIN: Measured signal input positive (0~100V) Thick red wire I+: Current input positive (Negative in the power supply must be connected in series) Thick black wire I-: Current input negative (Negative in the power supply must be connected in series?)