Leslie Eventemp temperature regulators use a self-contained, liquid-filled thermal system that is completely independent of external power sources such as air or electricity. They use only the flowing medium as the means to operate, resulting in lower initial cost and lower operating cost These high gain regulators are especially suited for storage-type heating or cooling service, where they provide close control of the cooling medium. They find widespread use in semi-instantaneous type coolers such as compressors or engine water jackets, vat cooling, etc All Leslie Eventemp regulators are available with an optional calibrated dial (in your choice of °F or °C) for quick, easy and dependable temperature settings. The dial eliminates waiting for equipment to heat up before the proper setting can be determined and avoids overheating due to Òguess” setting. It is suited for production line use where frequent readjustments are necessary for process work. The calibrated dial replaces the standard adjusting sleeve.