Non-contact temperature sensor measures inaccessible objects

OMEGA ENGINEERING OS212 series of compact non-contact temperature sensors are high quality, low cost devices that measure temperature of inaccessible or moving objects and materials. Device provides a fast response with high stability, 2-wire 4 to 20mA output proportional to target temperature, optional manual emissivity adjuster with display and stainless steel housing, sealed to IP65. Product is suitable for research and industrial applications.

http://www.omega.com/pptst/OS212.html