PZEM-003 0-300V 0-10A Voltage Kwh Meter DC Amp Volt Meter Ammeter RS485 Modbus With USB cable.1 RS485 interface is passive output, need external connect 5V power supply and the the external power supply should >100mA. 2 When the input test voltage is less than 7V, it must supply 5V independent work voltage through MICRO USB
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