Samples are applied to a zinc selenide attenuated total reflectance (ATR) sample plate and easily cleaned with a cloth & isopropyl alcohol. No solvents requiring special ventilation, expensive waste disposal or difficult to clean cells are needed. The analysis can be done by non-technical personnel with no formal training and is ideal for lab or field use. The InfraCal2 ATR-E has a touch screen display, data storage and transfer, a multi-language interface and password protected settings. The internal battery pack allows for portability and up to 12 hours continuous use, providing results in under a minute at a fuel loading rack, in a laboratory or at a pump in a fueling station.