Varian Ionization Gauge Tube model 563 - 303
The Bayard-Alpert type hot-cathode ionization gauge tubes employ a heated filament for the source of electrons.
The gauge tube offers superior performance over a pressure range of 2 x 10-10 to 1 x 10-3 torr. The inside of the glass body is platinum-coated, shielding the gauge elements from electrostatic charge at low pressures while draining off the static charge that can build up at high pressure..

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