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Product ID : G100K
G100K Ion Gauge Tube, 1 in Kovar Iridium
Description
More details on associated web pages:
Ionization Gauge Tubes, Bayard-Alpert Type
Bayard-Alpert Design and Dual Tungsten or Burn-out Resistant IridiumIonization Gauge Tubes
(Catalog F27)

Contain six temperature sensitive increments that turn irreversibly black at the rated temperature.