... and distribution system to indicate relative parameter,such as AC,DC,Voltage,power synchronous volume,frequency,expended voltage and overload current ... ,Ma50μA -500μA 1mA-500mADirectly switch onA1A-5A15A-750A75m V Buidout current dividerKA1KA-3KADC VoltmeterV3V-600VDirectly switch onKV1KV-3KVBuilout rated ...