What other tools besides a thermometer measures temperature?

Besides a thermometer, temperature can be measured using infrared sensors, which detect thermal radiation emitted by objects. Bimetallic temperature sensors, which consist of two different metals that expand at different rates, can also measure temperature. Additionally, thermocouples are widely used in industrial applications; they generate a voltage that corresponds to temperature differences. Lastly, resistance temperature detectors (RTDs) measure temperature by correlating the resistance of a conductor with temperature changes.