Thermocouple elements are temperature sensors that are useful over a wide range of temperatures. They are used with thermocouple temperature probes, bimetallic devices that are suitable for various temperature sensing applications. Thermocouple elements are also used with data acquisition (DAQ) systems and other temperature sensing equipment. A valuable temperature sensing tool, thermocouple elements are highly sensitive to small temperature changes and able to respond quickly to changes to the environment. Insulated devices are commonly available. Options include alumina, ceramic, fiberglass, mullite, polyvinyl chloride (PVC) and Teflon^®, a registered trademark of DuPont.