HPSR Series 959 hot-cathode, combination gauge controllers provide vacuum measurement from 10-10 to 1,000 torr. The 1/4 DIN units are available as hot-cathode controllers only or as hot-cathode/Pirani controllers when the Pirani option is added. Analog output, an RS232 port and two set points provide fast system control. A standard leak detector function includes a digital display and variable beeper to assist in locating leaks within a system. The controllers degas the hot-cathode sensors using electron beam, with remote filament and degas control and pressure indication during degas.