The FT/IR-4000 and FT/IR-6000 Series of FTIR spectrometers redefine the this powerful, easy-to-use technique. Each compact model offers reliable operation with some of the highest performance parameters in the industry.  Including a sealed interferometer with corner-cube mirrors and AccuTrac™ DSP technology for rapid and accurate tracking of mirror position and velocity for optimum wavenumber precision and signal-to-noise performance.