Fourier Transform Infrared/Attenuated Total Reflectance (FTIR/ATR), measures changes in a sample that occur when an internally reflected infrared beam makes contact with the sample.

Spotlight 400 FTIR is a full-featured spectrometer and macro sampling unit that operates in mid-IR, near-IR or dual range; pixel resolutions of 1.56 µm, 6.25µm, 25µm and 50µm.