Name: SD-670 Moving Iron Instruments AC Voltmeter; Model: Analog meter 670 Series; Type: SD-670 AC V; Accuracy: class 2.5; Specification: 30V 50V 75V 100V 120V 150V 200V 250V 450V 500V 600V, if over 600V, meters can be connected potential transformer with secondary voltage 100V