Taidacent Din Rail Type RS485 Modbus RTU PLC Control 0-20mA 4-20mA Signal Generator Current Signal Generator DC24V Adjustable Valve Analog Current Simulator with Display (Only 0-20mA Output): Amazon.com: Industrial & Scientific
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FY201 PWM Signal Generator+For Modbus 4-20mA 2-10V DDS Function Generator 1.44" | eBay