The Agilent / Varian 948 Helium Mass Spectrometer Leak Detector is a Platform Auto-Test® Helium Mass Spectrometer Leak Detectors. The 948 leak detector has a rugged metal enclosures that are mounted on casters for greater mobility. A key is used to access the lockable turret that houses the service pendant. It can be configured with dry or wet pumps. The unit features fully automatic operation, auto calibration, computer optimized preamplifier, LED display, and high sensitivity (2x10-11).