Bluetooth Optical Probe manufacturer / supplier in China, offering 4pin RS232 Nir Optical Sensor for Dlms IEC62056-21 Energy Meter Flowmeter Reading, My003-D 4pin RS232 IR Optical Probe for Dlms 940nm Infrared Industrial Communication, ANSI C12.18 IR Optical Communication Probe for Roud Utility Meters and so on.