The Model D-2 is a general purpose, 2-stage sensor with 65ºC (117ºF) of depression capability. It features wetted parts of stainless steel and glass, for durability in demanding industrial applications. The Model D-2 can be used as a benchtop sensor, mounted to a heat sink, or mounted to a cooling fan, if desired, for maximum operating range. Advanced features include field-replaceable optics and cooler assemblies, and auxiliary, visible light optics with viewing window for inspecting the mirror during operation.