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301 gauges
  • Electronic glass envelope
  • Welded tungsten hairpin filaments (F1 and F2)
  • Molybdenum grid (G)
  • Central collector in tungsten (C)
  • Bakeable up to 400 °C
  • Operating range: 10⁻³ to 10⁻¹⁰ Torr
  • Sensitivity to air : 18 /Torr