The world’s fastest, lowest power, gas compositional analysis autoresonant ion trap mass spectrometer (IT-MS) instrument with full data collection, spectral deconvolution, and data logging software. Compact size. 1–145 amu at 85 ms capture rates or 1-300 amu at 120 msec. UHV to 10-5 Torr, or 3 Torr with differential pump. Usually coupled with a total pressure gauge to provide partial pressures of each gas.