A Thermoelectric Cooler is a small device that creates a temperature differential across the module when DC power is applied. This phenomenon is known as the Peltier Effect. A Thermoelectric Cooler is composed of two ceramic substrates and thermally insulating N and P type semiconductor elements. Bismuth Telluride is preferred as the semiconductor material because it offers very good temperature differential properties in a room temperature environment. Thermoelectric Coolers are primarily used in cooling applications below ambient temperature. Some examples of uses are to cool reagent tubs in clinical diagnostics, sample storage compartments in analytical instruments, and outdoor enclosures in telecommunication electronics. They can also be used for temperature stabilization applications in order to maintain peak performance of medical imaging, optical devices, or laser systems used in a broad range of telecom, medical, and industrial applications.