The 9144 series field metrology wells extend high performance to the industrial process environment by maximizing portability, speed and functionality with little compromise to metrology performance. Field metrology wells are packed with functionality and are remarkably easy to use. They are lightweight, small and quick to reach temperature set points, yet they are stable, uniform and accurate. These industrial temperature loop calibrators are perfect for performing transmitter loop calibrations, comparison calibrations or simple checks of thermocouple sensors. With the process option, there is no need to carry additional tools into the field. Field environment conditions are typically unstable, having wide temperature variations. Each field metrology well has a built-in gradient temperature compensation (patent pending) that adjusts control characteristics to ensure stable performance in unstable environments. In fact, all specifications are guaranteed over the environmental range of 13 to 33 deg C.