Sorry, this family of products is no longer available. For recommended replacements see residual-gas-analyzers.
Please Note
Replacment parts for the 835 Vacuum Quality Monitor are still available from MKS, and can be found on this page: Vacuum Quality Monitor System Components
The Granville-Phillips® Series 835 Vacuum Quality Monitor (VQM™) combines the highest performance gas analysis technology with intelligent functional design that transforms complex measurement into actionable information. The 835 VQM is a low power mass spectrometer with full data collection, spectral deconvolution, and data logging at 85 ms capture rates for the full 1-145 amu measurement range or 125 ms for 1-300 amu.