Granville-Phillips 340 Vacuum Gauge Controller (VGC) measures pressure from less than 1 x 10-9 Torr to atmosphere, utilizing an ionization gauge and two Convectron gauges.

The Granville Philips Convectron Gauge tube used on the 5971 and 5972 mass spectrometers is available from S.I.S. This is a direct replacement for the HP original and screws into the fitting shown above.

Bayard-Alpert Design and Dual Tungsten or Burn-out Resistant Iridium

Use this to adapt ion gauge tubes to a 2 3/4" Conflat flange.