China Waterproof IP68 1m 2m K Type Thermocouple Probe with Fork Type Terminal Stainless Steel Tube

K-Type Thermocouple. The k-type thermocouple is the most commonly used, inexpensive electrical device that can measure temperatures from -200°to 1250°C(-328°F to+2282°F). This type of thermocouple is magnetic, typically made of nickel, with a property to change its output when the material reaches its Curie point at around 365°F.
How does a thermocouple work?

When two wires composed of dissimilar metals are joined at both ends and one of the ends is heated, there is a continuous current which flows in the thermoelectric circuit. If this circuit is broken at the center, the net open circuit voltage (the Seebeck voltage) is a function of the junction temperature and the composition of the two metals. Which means that when the junction of the two metals is heated, or cooled, a voltage is produced that can be correlated back to the temperature.