This guide explains what to check, how to perform essential calibrations, validation best practices, troubleshooting tips, and the benefits of a formal maintenance program. Unlike previous FTIR spectrometers, this instrument and its software were designed and built with performance verification as a core metric. All Nicolet iS20 spectrometers ship with traceable standards. Accurate spectrophotometric data underpins reliable results across chemistry, biology, environmental testing, coatings, and quality-control laboratories. These devices capture measurements for comparison against a known scale or index to ensure goods' color falls within acceptable tolerances, supporting higher quality.