This 1000-amp / 50mV Deltec shunt is the industry standard, calibrated with an accuracy of ± 0.25%. It is larger in size than the 500 amp shunt - meaning the Whiz Bang Jr. does not fit this shunt. Bolt size is ½".
SMA uses a 1000A / 50mV shunt. Radian uses a 1000A / 100mV shunt.