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Upgraded 4-20mA 0-24V Current Signal Generator, Riiai Current Voltage Adjustable Analog Simulator, Real-time Curve, Multiple Signal Types, 3000ma-h USB Rechargeable, Preset Value, for PLC Testing: Amazon.com: Industrial & Scientific
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4 to 20 mA Current Loops Made Easy | Harold G Schaevitz Industries LLC Linear Position LVIT LVDT Potentiometers and Temperature Sensors
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