... : 0~10A with R232 interface Features:1) Microprocessor control DC Power Supply2) Lock-in voltage at your choiceSpecifications ... LED)b) HY3010MR (0~30C, 0~10A, 2 LED), RS232 Interfacec) HY3020M (0~30V, 0~20A, 2 LED)d) ... HY3020MR (0~30V, 0~20A, 2 LED), RS232 Interfacee) HY5010M (0~50V, 0~10A, 2 LED)f ... ) HY5010MR (0~50V, 0~10A, 2 LED), RS232 Interface2) Input voltage: 104 to 127V AC (60Hz), or ...