Features: -100-1250c temperature range, 3 meters long, 13mm thread diameter, 10 cm probe Length thermocouple. A thermocouple is a device consisting of two different conductors (usually metal alloys) that produce a voltage proportional to a temperature difference between either end of the pair of conductors. They are widely used in the field of industry, agriculture, chemical and other automated temperature controlling. K Type thermocouple with flexible spring built in. 2 fork terminals for easy connection. Temperature measurement range is from -100 Celsius to 1250 Celsius degree.