Lot of vintage Simpson D.C. volt electric panel meters

Lot of two vintage Simpson panel meters for direct current (DC). One of the meters has a range of 0 to 30 volts and the other meter has a range of 0 to 5 volts. Both meter measure about 3.25" square and 1.75" deep, not counting the electric terminal screws. These are from the estate of an electrical engineer and both work measuring on a 12 volt dc system (an automotive battery).