... ratio setfreely, frequency:0-2.5KHZ(Hz). WH series 8 digits Electrical Meter/KWH meter Features: 1, Input: any ... output 4~20mA for any measuring parameters.4, Commumication: RS485/RS232 communication interface, MODBUS RTU protocol.5, Application: electrical energy ... in industrial control and measurement field, such as machinery, electrical cabinet, power sub-station, industrial automation, etc. In ...