... many oversea groups High cost performanc Jyins square panel meter in frequncy meter,volt meter ... panels and other electrical devices, in the industries of maritime shipping, rail transport, chemical flameproof, ... Extrinsic current shunt, The voltage specifications of the extrinsic current shunt of DC ammeters are 150mV,100mV, ... if the meter is of different specifications, with the accuracy unchanged.