Anti-Mass Spectrometer
- "It's - It's not shutting down; it's... Argh!" - Scientist
The Anti-Mass Spectrometer is a device in 
Half-Life used by scientists at the Black Mesa Research Facility to analyze samples of various materials from Xen and elsewhere. Judging by the related science of mass spectrometry, it was most likely used for measuring the mass-to-charge ratio of charged anti-particles.
The initial rift to Xen was opened during such an analysis of an exceptionally pure Xen Crystal.
Location
Its location in the middle of the Test Chamber gives the Anti-Mass Spectrometer an even more futuristic appearance as it and almost fills out the room completely with rotors, emitters, and likewise high-tech components. See Test Chamber.
Gallery
The Anti-Mass Spectrometer in the Test Chamber.
The Sample
The Xen Crystal sample that Gordon Freeman pushes into the the Anti-Mass Spectrometer at the beginning of Half-Life 1.
