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They have been the convection-enhanced Pirani meters for over 35 years and are used in thousands of vacuum processes.
Pressure range: Atmospheric pressure up to 10 -4 Torr.

Main characteristics:

• Wide range of vacuum pressure measurement from atmosphere to 1×10 -4 Torr
  
• Easy installation in places with restricted space
  
• Temperature compensation compensates for the effects of changes in ambient temperature