FTIR spectrometer NIRS-100 is a single-beam FTIR spectrometer that is operated by a PC. The spectrometer includes a container of desiccant that protects the beam splitter and other optical components from moisture damage. The system’s corner cube optics provide easy operation without requiring complicated electronics and additional moving parts. In addition, many components of the spectrometer are user replaceable, which saves time over the lifetime of the instrument.