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RS232 dB9 Opto Infrared Adapter for MID IEC Dlms Kwh Gas Water Heat Flow Meter Readout, Find Details and Price about RS232 Optical Probe RS232 Infrared from RS232 dB9 Opto Infrared Adapter for MID IEC Dlms Kwh Gas Water Heat Flow Meter Readout - Jiaxing Mingyuan Electronics Co., Ltd.