BK 1511 Digital Discharge Tube Power Supply. New digital LED meters, improving the resolution of the readings to 1%. Four separate power supplies, all insulated from each other and grounded: high voltage, bias voltage, filament supply, and Helmholtz coil supply. AC/DC, high voltage, and high current for versatility. Voltmeter selectable between 80V and 500V supplies. Electronic overload protection. Banana jack connectors.