Small panel mount instrument with square four mount hole bezel. Semicircular face has scale of -.1 to 0 to 1.25. White paint with inspectors stamp on side of body. Marked in silver paint on rear of body. Two threaded post wire connectors on rear of body.
Panel mounted instrument with white face and black markings on face. Painted black overall. Scale reads 0 to 35 volts DC with red line at 28.5 volts indicated. Black paint chipped at 9-10 o'clock possition showing brass underneath. For markings on face see TMS "Mark(s)". Two threaded post connectors on back, one marked "+".