1X USB to HART Modem cat modem converter handheld with 24V and loop resistance | eBay
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USB Hart Modem WS232UP USB to Hart Protocol Modem Hart Transmitter HART Convertor with 24VDC & Built-in Loop Resistor Temperaturer Controller: Amazon.com: Tools & Home Improvement
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1X USB to HART Modem cat modem converter handheld with 24V and loop resistance | eBay