A bimetallic thermometer is a temperature-measuring device that consists of two different metals bonded together. These metals expand at different rates when heated, causing the bimetallic strip to bend. This bending movement is then translated into a temperature reading on a dial or scale. Bimetallic thermometers are commonly used in various applications, including HVAC systems, ovens, and industrial processes. They are known for their durability and ability to provide accurate temperature readings without the need for electricity, making them a reliable choice for many settings.