Advanced R&D QUADRUPOLE HEAD for UTI Quadrupole Mass Spectrometer Quadrupole mass spectrometer mounted on a 4 -1/2 " CF UHV flange. Scans to 300 mass units includes electron multiplier. Various Ion sources available and / or SIMS prefilter. RF generator, control electronics, preamplifier also available. Excellent buy for the performance. High sensitivity tight / closed Ion source for ultrahigh RGA work and standard Ion Source or prefilter for SIMS work. This source need the 10 pin base flange which is available.	Closed Ion Source	Standard Ion source.