A temperature sensor is an electronic device that measures the temperature of an object or environment. It can also be called a thermocouple, thermometer, or thermal sensor. A thermocouple is a sensor made of two different metals that produces a voltage that is proportional to the temperature being measured. A thermometer is a device that measures temperature using a scale or digital readout. A thermal sensor is a type of temperature sensor that uses infrared light to detect temperature. In summary, temperature sensor synonyms include thermocouple, thermometer, and thermal sensor, among others, that can help measure the temperature of objects and environments.