Raytek Corp is a manufacturer of temperature measurement instruments for construction materials, metals processing, industrial coatings, glass and other industrial applications. Founded in 1963, Raytek, alongside Ircon and Datapaq, is now a part of Fluke Process Instruments, providing instruments for today's most demanding environments.

ISS provides a range of non-contact infrared temperature sensors, line scanners, handheld infrared thermometers and accessories developed by Raytek.