Wire thermocouples are temperature sensors made from two different metal wires joined at one end. When the junction experiences a temperature change, it generates a voltage that can be measured. This voltage is proportional to the temperature difference between the junction and the other ends of the wires, allowing for accurate temperature readings. These thermocouples are widely used in various applications, including industrial processes, HVAC systems, and laboratories. They are valued for their durability, fast response time, and ability to measure a wide range of temperatures, making them suitable for both high and low-temperature environments.