... , 2 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 207 ...