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2. Category:Vacuum gauges - Wikipedia

   en.wikipedia.org/wiki/Category:Vacuum_gauges

   This page was last edited on 2 December 2019, at 04:47 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

3. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics.

4. Hot-filament ionization gauge - Wikipedia

   en.wikipedia.org/wiki/Hot-filament_ionization_gauge

   The most common ion gauge is the hot-cathode Bayard–Alpert gauge, with a small collector inside the grid. [1] A glass envelope with an opening to the vacuum can surround the electrodes, but usually the nude gauge is inserted in the vacuum chamber directly, the pins being fed through a ceramic plate in the wall of the chamber. Hot-cathode ...

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7. Pirani gauge - Wikipedia

   en.wikipedia.org/wiki/Pirani_gauge

   The Pirani gauge consists of a metal sensor wire (usually gold plated tungsten or platinum) suspended in a tube which is connected to the system whose vacuum is to be measured. The wire is usually coiled to make the gauge more compact. The connection is usually made either by a ground glass joint or a flanged metal connector, sealed with an o ...