Thermocouples’ temperature sensors use two wires welded together to gauge a substance’s temperature. These wires are made of different metals and are only joined at one end. The difference in metals produces an electrical circuit when they encounter cold or hot substances, and the thermocouple’s thermometer converts the voltage into a temperature reading.
Different thermocouple sensors take their readings in different ways. Some probes’ sheaths can simply be removed to start measuring, while others must be submerged in the material in question. Similarly, the formula for turning voltage units into degrees varies.